Chapter 28: Reflection And Refraction

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  • 1/87 Questions

    When a light beam emerges from water into air, the average light speed

    • Increases.
    • Decreases.
    • Remains the same.
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Chapter 28: Reflection And Refraction - Quiz
About This Quiz

Explore the fundamental principles of light in 'Chapter 28: Reflection and Refraction'. This quiz assesses understanding of light behavior, including emission, reflection paths, and the laws governing refraction. Key for students enhancing their physics knowledge, focusing on practical and theoretical aspects of light.

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  • 2. 

    Optical fibers are now used by

    • Surgeons.

    • Mechanics.

    • Engineers.

    • All of these

    Correct Answer
    A. All of these
    Explanation
    Optical fibers are now used by surgeons, mechanics, and engineers. Surgeons use optical fibers in minimally invasive surgeries to provide illumination and transmit images from inside the body. Mechanics use optical fibers for inspection and maintenance of hard-to-reach areas in machinery. Engineers utilize optical fibers for various applications such as telecommunications, data transmission, and sensing technology. Therefore, all of these professions benefit from the use of optical fibers.

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  • 3. 

    Refraction causes the bottom of a swimming pool to appear

    • Farther down than it actually is.

    • Closer to the surface than it actually is.

    • Neither.

    Correct Answer
    A. Closer to the surface than it actually is.
    Explanation
    When light travels from one medium to another, such as from air to water in a swimming pool, it undergoes refraction. Refraction occurs because light travels at different speeds in different mediums. In this case, as light enters the water, it slows down and bends towards the normal (an imaginary line perpendicular to the water's surface). This bending of light causes the bottom of the swimming pool to appear closer to the surface than it actually is.

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  • 4. 

    A "burning glass" used to concentrate sunlight in a tiny spot is a

    • Converging lens.

    • Diverging lens.

    • Either

    • neither

    Correct Answer
    A. Converging lens.
    Explanation
    A "burning glass" is a device used to concentrate sunlight in a tiny spot. This implies that the lens is able to converge the sunlight rays to a single point. Therefore, the correct answer is a converging lens, which has the ability to bring parallel rays of light together at a focal point.

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  • 5. 
    The image in a pinhole camera is - ProProfs

    The image in a pinhole camera is

    • Always inverted.

    • Sometimes inverted.

    • Always right-side up

    Correct Answer
    A. Always inverted.
    Explanation
    The image in a pinhole camera is always inverted because the light rays passing through the small hole (pinhole) create an inverted image on the opposite side of the camera. This occurs because the rays diverge as they pass through the hole, resulting in an upside-down image. This phenomenon is a result of the basic principles of optics and the way light behaves when passing through a small aperture.

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  • 6. 

    A beam of light travels fastest in

    • Glass.

    • Water.

    • Plastic.

    • Air.

    • Is the same in each of these

    Correct Answer
    A. Air.
    Explanation
    The speed of light in a medium is determined by the refractive index of that medium. The refractive index of air is lower compared to glass, water, and plastic. This means that light travels faster in air than in these other materials. Therefore, the correct answer is air.

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  • 7. 

    Atmospheric refraction tends to make daytimes

    • Longer.

    • Shorter.

    • No change in day length

    Correct Answer
    A. Longer.
    Explanation
    Atmospheric refraction is the bending of light as it passes through the Earth's atmosphere. This bending causes the apparent position of the Sun to be slightly higher than its actual position, resulting in the Sun appearing to rise earlier and set later than it would if there was no refraction. As a result, atmospheric refraction makes daytimes longer by extending the duration of daylight.

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  • 8. 

    A person standing waist-deep in a swimming pool appears to have short legs because of light

    • Reflection.

    • Absorption.

    • Interference.

    • Diffraction.

    • Refraction.

    Correct Answer
    A. Refraction.
    Explanation
    When light passes from one medium to another, it changes direction. This phenomenon is called refraction. In the case of a person standing waist-deep in a swimming pool, the light from their legs travels from the water (a denser medium) to the air (a less dense medium). This causes the light to bend away from the normal, making the legs appear shorter than they actually are. Hence, the person appears to have short legs due to refraction.

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  • 9. 

    The incident light ray, the reflected light ray, and the normal between them

    • Lie in the same plane.

    • May or may not lie in the same plane.

    • Lie in planes that are perpendicular to one another.

    Correct Answer
    A. Lie in the same plane.
    Explanation
    When light rays interact with a surface, the incident ray (the incoming ray), the reflected ray (the ray bouncing off the surface), and the normal (a line perpendicular to the surface) all lie in the same plane. This is known as the law of reflection. The incident ray and the reflected ray are on opposite sides of the normal, and they both lie in the same plane as the normal. Therefore, the correct answer is that they lie in the same plane.

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  • 10. 

    Light will almost always travel from one place to another along a path of least

    • Distance.

    • Time.

    • Effort.

    • Expense.

    • Complication.

    Correct Answer
    A. Time.
    Explanation
    Light will almost always travel from one place to another along a path of least time. This is because light travels at a constant speed in a vacuum, and it follows the principle of least time, which states that light will take the path that requires the least amount of time to reach its destination. This principle is based on Fermat's principle of least time, which states that light follows the path that minimizes the travel time between two points. Therefore, when light travels from one place to another, it will always take the path that minimizes the time taken.

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  • 11. 

    To see his full height, a boy that is 1 meter tall needs a mirror that is at least

    • 0.33 m tall.

    • 0.50 m tall.

    • 0.75 m tall.

    • 1 m tall.

    • Depends on how far the mirror is from the boy

    Correct Answer
    A. 0.50 m tall.
    Explanation
    A mirror needs to be at least half the height of the person using it in order for them to see their full height. Since the boy is 1 meter tall, the mirror needs to be at least 0.50 meters tall.

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  • 12. 

    Diffuse reflection occurs when the size of surface irregularities is

    • Small compared to the wavelength of the light used.

    • Large compared to the wavelength of the light used.

    • Microscopic.

    Correct Answer
    A. Large compared to the wavelength of the light used.
    Explanation
    Diffuse reflection occurs when the size of surface irregularities is large compared to the wavelength of the light used. This means that the surface is rough and uneven, causing the light to scatter in different directions. In contrast, if the surface irregularities are small compared to the wavelength of light, the reflection would be specular, where the light reflects at the same angle as it hits the surface. Therefore, the correct answer is that diffuse reflection occurs when the size of surface irregularities is large compared to the wavelength of the light used.

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  • 13. 

    The type of lens that spreads parallel light is a

    • Converging lens.

    • Diverging lens.

    • Combination converging-diverging lens.

    Correct Answer
    A. Diverging lens.
    Explanation
    A diverging lens is the correct answer because it spreads parallel light rays outwards, causing them to diverge. This type of lens has a thinner center and thicker edges, causing light to refract away from the center. A converging lens, on the other hand, brings parallel light rays together at a focal point. A combination converging-diverging lens is not the correct answer as it would have both converging and diverging properties, which is not mentioned in the question.

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  • 14. 

    Which of the following can be projected onto a viewing screen?

    • A real image

    • A virtual image

    • Both

    • Neither

    Correct Answer
    A. A real image
    Explanation
    A real image can be projected onto a viewing screen. A real image is formed when light rays actually converge at a point, creating an image that can be captured on a screen or a surface. This is in contrast to a virtual image, which is formed when light rays appear to diverge from a point, and cannot be projected onto a screen. Therefore, only a real image can be projected onto a viewing screen.

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  • 15. 

    Light is emitted when

    • Electron clouds of atoms are forced into oscillation.

    • Atomic nuclei are made to vibrate.

    • Electromagnetic waves emanate from matter.

    • High-frequency sound waves strike matter.

    Correct Answer
    A. Electron clouds of atoms are forced into oscillation.
    Explanation
    Light is emitted when the electron clouds of atoms are forced into oscillation. This is because when an atom absorbs energy, its electrons move to higher energy levels. When these electrons return to their original energy levels, they release the excess energy in the form of light. This process is known as electron transition or electron oscillation, and it is responsible for the emission of light. Atomic nuclei vibrating, electromagnetic waves emanating from matter, and high-frequency sound waves striking matter do not directly result in the emission of light.

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  • 16. 

    Light travels fastest in

    • Warm air.

    • Cool air.

    • A vacuum.

    Correct Answer
    A. A vacuum.
    Explanation
    Light travels fastest in a vacuum because there are no particles to slow it down. In a vacuum, there is no air or any other medium to impede the speed of light, allowing it to travel at its maximum velocity. In contrast, in both warm and cool air, there are molecules present that can scatter and absorb light, causing it to slow down. Therefore, a vacuum provides the least resistance to the propagation of light, resulting in its fastest speed.

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  • 17. 

    You wish to photograph the image of your little sister, who is standing 2 meters from a plane mirror. Holding the camera beside her head, you should set the distance for

    • 1 meter.

    • 2 meters.

    • 3 meters.

    • 4 meters.

    • None of these

    Correct Answer
    A. 4 meters.
    Explanation
    When photographing an image in a plane mirror, the distance between the camera and the mirror should be equal to the distance between the mirror and the object being photographed. In this case, since the little sister is standing 2 meters from the mirror, the camera should be placed 2 meters on the other side of the mirror, resulting in a total distance of 4 meters.

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  • 18. 

    Atmospheric refraction makes the daylight hours a bit

    • Longer.

    • Shorter.

    • Longer in summer but shorter in winter.

    Correct Answer
    A. Longer.
    Explanation
    Atmospheric refraction is the bending of light as it passes through the Earth's atmosphere. This bending causes the light to follow a curved path, which results in the apparent position of the Sun being slightly higher in the sky than its actual position. As a result, the daylight hours appear longer than they would be without atmospheric refraction.

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  • 19. 

    A mirage is a result of atmospheric

    • Reflection.

    • Refraction.

    • Scattering.

    • Dispersion.

    • Aberrations.

    Correct Answer
    A. Refraction.
    Explanation
    A mirage is a phenomenon that occurs due to the refraction of light. Refraction happens when light passes through different mediums with varying densities, causing the light rays to change direction. In the case of a mirage, the air near the ground is hotter than the air above it, creating a gradient in the refractive index. This causes the light rays to bend and create an optical illusion, making distant objects appear distorted or displaced. Therefore, the correct answer is refraction.

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  • 20. 

    Light refracts when traveling from air into glass because light

    • Has greater intensity in air than in glass.

    • Has greater intensity in glass than in air.

    • Has greater frequency in air than in glass.

    • Has greater frequency in glass than in air.

    • Travels slower in glass than in air.

    Correct Answer
    A. Travels slower in glass than in air.
    Explanation
    When light travels from air into glass, it slows down due to the difference in the refractive indices of the two mediums. This change in speed causes the light to bend or refract.

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  • 21. 

    When a pulse of white light is incident on a piece of glass, strictly speaking, the first color to emerge is

    • Red.

    • Orange.

    • Green.

    • Violet.

    • They all emerge at the same time.

    Correct Answer
    A. Red.
    Explanation
    When a pulse of white light is incident on a piece of glass, the first color to emerge is red. This is because white light is made up of a combination of different colors, and when it passes through a medium like glass, it gets refracted. The different colors in the white light have different wavelengths, and as a result, they get separated. Red light has the longest wavelength among the visible colors, so it gets refracted the least and emerges first when white light passes through glass.

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  • 22. 
    Reflected light from the moon in a lake often appears as a vertical column when the water is - ProProfs

    Reflected light from the moon in a lake often appears as a vertical column when the water is

    • Perfectly still.

    • Slightly rough.

    • Very rough - churning with waves.

    Correct Answer
    A. Slightly rough.
    Explanation
    When the water in a lake is perfectly still, the reflection of the moon appears as a mirror image, without any distortion. However, when the water is slightly rough, the surface of the lake creates small ripples or waves. These ripples cause the reflected light from the moon to scatter and create a vertical column of light. This phenomenon is known as "scintillation" and is commonly observed when the water is slightly rough.

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  • 23. 

    Rainbows are not usually seen as complete circles because

    • The ground is usually in the way.

    • They are actually elliptical.

    • They have no bottom part.

    • Raindrops are not perfectly round.

    • Rainbows are actually arched shaped.

    Correct Answer
    A. The ground is usually in the way.
    Explanation
    Rainbows are not usually seen as complete circles because the ground is usually in the way. When we see a rainbow, it is formed by the reflection, refraction, and dispersion of sunlight in raindrops. The light enters the raindrop, reflects off the inside surface, and then exits the raindrop. However, to see a complete circle, the observer would need to be at a high vantage point, such as in an airplane or on a mountain, where the ground does not obstruct the view. Since most people view rainbows from ground level, the bottom half of the circle is blocked by the Earth's surface, resulting in an arched shape.

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  • 24. 

    Stars twinkle when seen from the Earth. When seen from the moon, stars

    • Twinkle more.

    • Twinkle less.

    • Don't twinkle.

    Correct Answer
    A. Don't twinkle.
    Explanation
    Stars twinkle when seen from the Earth because of the Earth's atmosphere causing the light from the stars to scatter. However, the moon does not have an atmosphere, so there is no scattering of light. As a result, stars appear steady and do not twinkle when seen from the moon.

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  • 25. 

    Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at

    • Different speeds.

    • The same speed.

    • Light travels at the same speed everywhere.

    Correct Answer
    A. The same speed.
    Explanation
    Different colors of light travel at the same speed. This is because in a vacuum, there is no medium to slow down or speed up the different colors of light. The speed of light in a vacuum is constant, regardless of the color of light.

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  • 26. 

    A surface that is considered rough for infrared waves may be polished for

    • Radio waves.

    • Light waves.

    • Both of these

    • None of these

    Correct Answer
    A. Radio waves.
    Explanation
    The answer is radio waves because different types of waves interact with surfaces differently. Infrared waves are sensitive to surface roughness and can be absorbed or scattered by rough surfaces, while radio waves are less affected by surface roughness and can pass through or bounce off smoothly. Therefore, a surface that is considered rough for infrared waves can be polished to improve the transmission or reflection of radio waves. Light waves, on the other hand, are also affected by surface roughness and polishing would improve their transmission as well.

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  • 27. 

    The shortest plane mirror in which you can see your entire image is

    • Half your height.

    • About 3/4 your height.

    • About 1/3 your height.

    • Equal to your height.

    • Dependent on your distance from the mirror.

    Correct Answer
    A. Half your height.
    Explanation
    The correct answer is half your height. This is because a plane mirror reflects light at the same angle it hits the mirror, creating a virtual image that appears behind the mirror. In order to see your entire image in the mirror, the mirror must be tall enough to reflect the top of your head to the bottom of your feet. Therefore, a mirror that is half your height will be sufficient to see your entire image.

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  • 28. 

    In optical fibers of uniform density, light actually

    • Curves in a direction parallel to the central axis of the fiber.

    • Travels in straight-line segments.

    • Travels along the outer surface of the fiber.

    • None of the above choices are correct.

    Correct Answer
    A. Travels in straight-line segments.
    Explanation
    In optical fibers of uniform density, light travels in straight-line segments. This is because the fiber is designed in such a way that the refractive index of the core is greater than the refractive index of the cladding. This causes the light to undergo total internal reflection, bouncing off the walls of the core and traveling in a straight path along the central axis of the fiber. This property allows for efficient transmission of light signals through the fiber without significant loss or distortion.

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  • 29. 

    The image of the "infinitely-far-away" sun produced by a converging lens appears

    • Between the lens and the focal point.

    • At the focal point.

    • Beyond the focal point.

    Correct Answer
    A. At the focal point.
    Explanation
    When an object is placed at an infinite distance from a converging lens, the lens forms an image at its focal point. This is because parallel rays of light from the object converge at the focal point after passing through the lens. Therefore, the image of the "infinitely-far-away" sun produced by a converging lens appears at the focal point.

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  • 30. 

    Objects infinitely far away are focused by a converging lens

    • In front of the focal point

    • At the focal point.

    • Beyond the focal point.

    Correct Answer
    A. At the focal point.
    Explanation
    When an object is infinitely far away, the light rays coming from it are parallel. A converging lens is designed to bring parallel rays of light to a focus at a specific point called the focal point. Therefore, when an object is infinitely far away, the converging lens will focus the parallel rays of light exactly at its focal point.

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  • 31. 

    A yellow-white candle flame reflected from a piece of red glass shows two images; one from each surface.

    • Both images are yellow-white.

    • One image is yellow-white and the other red.

    • Both images are red.

    • Both images are reddish yellow.

    Correct Answer
    A. One image is yellow-white and the other red.
    Explanation
    When a yellow-white candle flame is reflected from a piece of red glass, it creates two images. One image is yellow-white because it is the reflection of the original flame. The other image appears red because the red glass filters out all colors except for red, resulting in a red reflection. Therefore, one image is yellow-white and the other is red.

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  • 32. 

    Chromatic aberration is absent in

    • Converging lenses

    • Diverging lenses.

    • Front surface plane mirrors.

    Correct Answer
    A. Front surface plane mirrors.
    Explanation
    Front surface plane mirrors do not suffer from chromatic aberration because they reflect light without bending or refracting it. Chromatic aberration occurs when different wavelengths of light are refracted differently, causing color fringing and blurring. Converging and diverging lenses, on the other hand, can cause chromatic aberration due to the way they refract light.

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  • 33. 

    A diver shines light up to the surface of a smooth pond at a 10-degree angle to the normal. Some light passes into the air above, and the part that reflects back into the water makes an angle to the normal of

    • Less than 10 degrees.

    • 10 degrees.

    • More than 10 degrees.

    Correct Answer
    A. 10 degrees.
    Explanation
    When light travels from a denser medium (water) to a less dense medium (air), it undergoes a change in direction called refraction. The angle of refraction is determined by Snell's law, which states that the ratio of the sines of the angles of incidence and refraction is equal to the ratio of the velocities of light in the two media. In this case, since the angle of incidence is 10 degrees, the angle of refraction will also be 10 degrees. This means that the light that reflects back into the water will make an angle of 10 degrees with the normal.

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  • 34. 

    When light passes through an ordinary window pane, its angle of emergence is

    • Usually less than its angle of incidence.

    • Always less than its angle of incidence.

    • The same as its angle of incidence.

    • Usually more than its angle of incidence.

    • Always more than its angle of incidence.

    Correct Answer
    A. The same as its angle of incidence.
    Explanation
    When light passes through an ordinary window pane, its angle of emergence is the same as its angle of incidence. This is because the window pane is made of a transparent material with a uniform refractive index, which means that the speed of light remains constant as it passes through the pane. According to the law of refraction, the angle of incidence and the angle of emergence are equal when light passes through a medium with a uniform refractive index. Therefore, the correct answer is that the angle of emergence is the same as its angle of incidence.

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  • 35. 

    The twinkling of the stars is a result of atmospheric

    • Reflection.

    • Refraction.

    • Scattering.

    • Dispersion.

    • Aberrations.

    Correct Answer
    A. Refraction.
    Explanation
    The twinkling of stars is caused by the phenomenon of refraction. When starlight passes through the Earth's atmosphere, it encounters different layers of air with varying densities. These variations in density cause the light to bend or refract, resulting in the twinkling effect that we observe from the ground. This refraction is responsible for the apparent fluctuation in the brightness of stars, giving them a twinkling appearance.

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  • 36. 

    The secondary rainbow is dimmer than the primary rainbow because

    • Its colors are inverted.

    • It is larger, and its energy is spread over more area.

    • It is farther from the viewer.

    • It simply has much less energy than the primary bow.

    • Of an extra reflection and refraction in the drops.

    Correct Answer
    A. Of an extra reflection and refraction in the drops.
    Explanation
    The secondary rainbow is dimmer than the primary rainbow because of an extra reflection and refraction in the drops. When light enters a water droplet, it undergoes both reflection and refraction. In the case of the secondary rainbow, the light undergoes an additional reflection before exiting the droplet. This results in a more spread out and dispersed light, causing the secondary rainbow to appear dimmer compared to the primary rainbow.

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  • 37. 

    The moon's redness during a lunar eclipse results from

    • Only lower frequencies being reflected from the moon.

    • Infrared radiation that is normally blocked.

    • An optical illusion.

    • Refraction by the Earth's atmosphere of Earth's sunrises and sunsets.

    • None of these

    Correct Answer
    A. Refraction by the Earth's atmosphere of Earth's sunrises and sunsets.
    Explanation
    During a lunar eclipse, the moon appears red because of the refraction of Earth's sunrises and sunsets by the Earth's atmosphere. The Earth's atmosphere acts as a lens, bending and scattering the sunlight as it passes through, causing the longer wavelengths (red light) to be more visible. This phenomenon is similar to how the sky appears red during a sunset or sunrise on Earth. The moon reflects this reddened light, giving it a red hue during a lunar eclipse.

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  • 38. 

    Object and image for a plane mirror lie

    • Along the same plane.

    • Equal distances from the mirror.

    • At right angles to each other.

    • All of these

    Correct Answer
    A. Equal distances from the mirror.
    Explanation
    When an object is placed in front of a plane mirror, the image formed is a virtual image that appears to be behind the mirror. The image is formed by the reflection of light rays from the object. In a plane mirror, the reflection occurs at the same angle as the incidence, resulting in the image appearing to be the same distance behind the mirror as the object is in front of it. Therefore, the object and its image in a plane mirror lie at equal distances from the mirror.

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  • 39. 

    Standing at the shore of a still lake, the reflected view of scenery on the far side of the lake is the view you would see if you were upside down with your eye in the line of sight

    • Where it already is.

    • At the surface of the water where the light reflects.

    • Directly beneath you, as far below water level as you are above.

    • Close to the distant shore.

    • None of these

    Correct Answer
    A. Directly beneath you, as far below water level as you are above.
    Explanation
    When standing at the shore of a still lake, the reflected view of the scenery on the far side of the lake is the view you would see if you were directly beneath yourself, as far below water level as you are above. This is because the reflection in the water appears to be a mirror image of the surroundings, and if you were upside down with your eye in the line of sight where it already is, the reflection would match the actual view. Therefore, the correct answer is directly beneath you, as far below water level as you are above.

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  • 40. 

    Different colors are dispersed by a prism because different colors in the prism have different

    • Frequencies.

    • Speeds.

    • Directions.

    • Energies.

    • None of these

    Correct Answer
    A. Speeds.
    Explanation
    Different colors are dispersed by a prism because different colors in the prism have different speeds. When white light passes through a prism, it is refracted at different angles depending on its wavelength. This causes the different colors of light to separate and form a spectrum. This phenomenon, known as dispersion, occurs because each color of light travels at a slightly different speed through the prism. Therefore, the correct answer is speeds.

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  • 41. 

    Chromatic aberration is a consequence of different colors in a lens having different

    • Aberrations.

    • Frequencies.

    • Energies.

    • Critical angles.

    • Speeds.

    Correct Answer
    A. Speeds.
    Explanation
    Chromatic aberration refers to the phenomenon where different colors of light focus at different points when passing through a lens, resulting in blurred or distorted images. This occurs because the speed of light varies for different colors, causing them to bend at different angles as they pass through the lens. Therefore, the correct answer is "speeds."

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  • 42. 

    The amount of light reflected from the front surface of a common windowpane is about

    • 4 percent.

    • 8 percent.

    • 40 percent.

    • 92 percent.

    • 96 percent.

    Correct Answer
    A. 4 percent.
    Explanation
    The correct answer is 4 percent because windowpanes are designed to allow light to pass through them rather than reflect it. Therefore, only a small amount of light is reflected from the front surface of a common windowpane, which is approximately 4 percent.

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  • 43. 

    If you walk towards a mirror at a certain speed, the relative speed between you and your image is

    • Half your speed.

    • Your speed.

    • Twice your speed.

    • None of these

    Correct Answer
    A. Twice your speed.
    Explanation
    When you walk towards a mirror, your image in the mirror also appears to be walking towards you. This is because the light rays from your body reflect off the mirror and reach your eyes, creating the illusion of an image. Since you are moving towards the mirror and your image is also moving towards you, the relative speed between you and your image is the sum of your individual speeds. Therefore, the relative speed between you and your image is twice your speed.

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  • 44. 

    The average speed of light is greatest in

    • Red glass.

    • Orange glass.

    • Green glass.

    • Blue glass.

    • Is the same in all of these

    Correct Answer
    A. Red glass.
    Explanation
    The average speed of light is greatest in red glass because red light has the longest wavelength among all visible colors. When light passes through a medium, its speed is inversely proportional to the refractive index of the medium. Since red light has a longer wavelength, it experiences less interaction with the atoms in the glass, resulting in a higher speed compared to other colors. Therefore, the average speed of light is greatest in red glass.

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  • 45. 

    A person who sees more clearly under water without eyeglasses or a face mask is

    • Nearsighted.

    • Farsighted.

    • Neither

    Correct Answer
    A. Nearsighted.
    Explanation
    A person who sees more clearly under water without eyeglasses or a face mask is nearsighted. Nearsightedness, also known as myopia, is a common vision condition where distant objects appear blurry, while close objects can be seen more clearly. When underwater, the water acts as a natural lens and helps to refract light in a way that compensates for the nearsightedness, resulting in improved clarity of vision. This phenomenon does not occur for a person who is farsighted or does not have any vision impairment.

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  • 46. 

    When you look at yourself in a pocket mirror, and then hold the mirror farther away, you see

    • More of yourself.

    • Less of yourself.

    • The same amount of yourself.

    Correct Answer
    A. The same amount of yourself.
    Explanation
    When you look at yourself in a pocket mirror and hold it farther away, the size of your reflection in the mirror remains the same. This is because the mirror reflects light in a way that preserves the proportions and size of the objects being reflected. Therefore, regardless of the distance between the mirror and your face, you will see the same amount of yourself in the mirror.

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  • 47. 

    The inversion of your image in a plane mirror is actually an inversion of

    • Left-right.

    • Up-down.

    • Front-back.

    • All of these

    Correct Answer
    A. Front-back.
    Explanation
    When an object is reflected in a plane mirror, the image appears to be flipped from front to back. This means that the left and right sides of the object are switched in the reflection. However, the up-down orientation remains the same. Therefore, the inversion in a plane mirror is only in the front-back direction.

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  • 48. 

    When you view a distant rainbow, each single water drop contributes to the bow

    • A single color.

    • Either low-, middle-, or high-frequency colors in most cases.

    • All the colors of the rainbow.

    Correct Answer
    A. A single color.
    Explanation
    When viewing a distant rainbow, each single water drop contributes to the bow by refracting and dispersing light. This refraction and dispersion of light causes the different colors of the rainbow to separate and become visible. However, when we view the rainbow from a distance, we see a combination of all these colors blended together, appearing as a single color to our eyes. Therefore, when viewing a distant rainbow, each individual water drop contributes to the overall appearance of a single color.

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  • 49. 

    Your vision is sharpest when your pupil is

    • Dilated.

    • Constricted.

    • Same either way.

    Correct Answer
    A. Constricted.
    Explanation
    When the pupil is constricted, it means that it has become smaller in size. This allows less light to enter the eye, which helps to focus the incoming light onto the retina. As a result, the image formed on the retina is clearer and sharper, leading to better vision. On the other hand, when the pupil is dilated, it means that it has become larger in size. This allows more light to enter the eye, but it also causes the incoming light to scatter, leading to a blurry image on the retina and decreased visual acuity. Therefore, the correct answer is constricted.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 15, 2013
    Quiz Created by
    Drtaylor
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