Light reflection and refraction

A light ray falls on a reflective surface as shown in the figure. What will the angle of reflection be?

• 40

• 50

• 60

• 70

A light ray falls on a mirror at an angle of 40∘ with the normal to the mirror, as shown in the figure below. The mirror is then rotated by 20∘ in the clockwise direction and the incident beam is unchanged. Calculate the angle between the reflected beam and the mirror in the new position.

• 50

• 20

• 60

• 70

A light ray falls on mirror A, as shown in the figure, to be reflected onto surface B. What is the horizontal distance from mirror A at which the reflected ray will meet surface B?

• 34.6 cm

• 10.2 cm

• 17.3 cm

• 11.5 cm

In the figure shown below, what is the refractive index of material X?

• 1.52

• 1.05

• 1.54

• 1.14

What happens to the refractive index of a material when the angle of incidence of a light ray on its surface doubles?

• It remains constant.

• It increases four times.

• It decreases to half.

• It doubles.

A light ray travels across three different media, as shown in the figure below. Which of the following represents the correct relation between the refractive indices of the three materials?

A and B are two optical media. Medium B has a lower optical density than medium A. A light ray is transmitted from A to B with an angle of incidence of zero. Which of the following properties of the light ray does not change?

• Direction

• Speed

• None of the answers are correct.

• Wavelength

In refraction, when light is passing through media of different refractive indices, what property of light does not change?

• Speed

• Wavelength

• Direction

• Frequency

A light ray traveling in the water with a refractive index of 1.3 is incident on the flat surface of a plastic block with a refractive index of 1.6, traveling through the water at an angle of 30 degrees from the surface. what's the refracted angle?

• 23.96

• 44.72

• 32.6

• 37.97