4. When light is refracted across a surface, the angle of refraction will be lar

ID: 1630813 • Letter: 4

Question

4. When light is refracted across a surface, the angle of refraction will be larger than angle of incidence when:

(a) The refractive index of the media the light comes from is less than the refractive index of the media it enters.

(b) The speed of light in the media the light enters is slower than the speed of light in the media it comes from.

(d) The speed of light in the media the light enters is greater than the speed of light in the media it comes from.

5. The speed of light in vacuum is 3.00 × 108 m s1. What is the speed of light in glass?

(a) It depends on the type of glass, but typically around 4.51 × 108 m s1.

(b) Light cannot travel in glass, it is always reflected.

(d) It depends on the type of glass, but typically around 1.94 × 108 m s1.

6. Which of the following conditions are required to observe light dispersion through media (choose all that are required)

(a) The light being observed must be white light before entering the media.

(b) The media must be a prism.

(d) The refractive index of the media must depend on the wavelength of light.

7. Total internal reflection can occur when:

(a) The refractive index of the incident material is equal to the refractive index of the refractive material.

(b) The refractive index of the incident material is less than the refractive index of the refractive material.

9. A light ray enters a piece of plastic from water and does not bend. The refractive index of the plastic is:

(a) greater than that of water.

(b) less than that of water.

(d) not enough information

4. ni sin(i) = nr sin(r)

r > i

sin(r) > sin(i)

ni > nr

v_i < v_r

Ans: (b, c)

5. n = 1.5

Ans(d)

6. (a, b. d)

7. c

9. (C)

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