Bend The Light: Light And Reflection Quiz

In a transverse wave, the particles move perpendicular to the direction of the wave motion. This means that while the wave is traveling horizontally, the particles of the medium are moving up and down or oscillating vertically. This can be observed in waves such as light waves or waves on a string, where the particles of the medium are displaced at right angles to the direction of the wave propagation.

Parallel rays that approach a concave mirror must reflect through the focal point. This is because a concave mirror is a converging mirror, meaning that it brings parallel rays of light together at a specific point called the focal point. This property allows concave mirrors to form real and inverted images.

Microwaves have wavelengths that are longer than visible light. This is because the electromagnetic spectrum is a continuum of different wavelengths, with visible light falling in the middle range. Microwaves have longer wavelengths than visible light, which allows them to pass through certain materials, such as glass and plastic. This property is utilized in microwave ovens, where microwaves are absorbed by water molecules in food, causing them to vibrate and generate heat.

When an object is placed between the focal point and the vertex of a concave mirror, it will produce an image that is larger and virtual. This is because the concave mirror converges the light rays coming from the object, causing them to diverge after reflection. The image formed is virtual, meaning it cannot be projected onto a screen, and it is larger than the object. This can be observed when looking into a concave makeup mirror, where the reflected image appears larger than the actual object being reflected.

Fluorescence is the correct answer because it refers to the emission of light by a substance that has absorbed light or other electromagnetic radiation. In this context, forensic investigators use ultraviolet light to detect biological fluids, such as blood or semen, which emit a characteristic fluorescence when exposed to the specific wavelength of ultraviolet light. This technique is commonly used in crime scene investigations to identify and locate potential evidence.

When an object is placed beyond the focal point of a concave mirror, the image formed is larger and inverted. In this case, the object is placed at a distance of 45 cm from the vertex of the mirror, which is greater than the focal length of 30 cm. Therefore, the image formed will be larger than the object and will be inverted, meaning it will be upside down compared to the object.

The correct answer is "all of the above". The angle of incidence for a wave can be measured between the incident ray and the normal, which is the line perpendicular to the boundary. It can also be measured between the incident wavefront and the boundary, which is the surface where the wave interacts with a different medium. The angle of incidence is equal to the angle of reflection, which means that the angle at which the wave approaches the boundary is the same as the angle at which it bounces off. Additionally, the angle of incidence does not depend on the frequency of the source, meaning that it remains constant regardless of the frequency of the wave.

The image formed by a plane mirror is located at the same distance behind the mirror as the object is in front of it. Since the student is located 1.8 m from the mirror, the image will also be located 1.8 m behind the mirror. Therefore, the correct answer is 1.8 m, not 3.6 m as stated in the given answer.

The correct answer is period. The period of a wave is the time it takes for one complete vibration or oscillation to occur. It is the shortest time interval in which the wave motion repeats itself. The amplitude refers to the maximum displacement of particles in a wave, the wavelength is the distance between two consecutive points in a wave that are in phase, the frequency is the number of complete vibrations or oscillations that occur in one second, and speed refers to how fast the wave is traveling.

In plane mirrors, the images formed are virtual and upright. This means that the image is not a real image but appears to be behind the mirror. It is also upright, meaning it is not inverted or flipped. The size of the image in a plane mirror is the same as the size of the object. Therefore, the correct answer is virtual and upright.

As an object is placed further and further from a concave mirror, the image approaches the focal point. This is because a concave mirror converges light rays and forms real images when the object is located beyond the focal point. As the object moves closer to the mirror, the image gets larger and larger until it reaches the focal point. Beyond the focal point, the image becomes virtual and no longer forms on a screen. Therefore, the correct answer is that the image approaches the focal point.

The distance of the image in convex mirrors will not always have a negative value. In convex mirrors, the image is always virtual and located behind the mirror. However, the distance of the image can be positive or negative depending on the position of the object relative to the mirror. If the object is located beyond the focal point, the image distance will be negative. But if the object is located between the mirror and the focal point, the image distance will be positive. Therefore, the statement is false.