Name:    Unit 10E Chapater 12 Quiz

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

The bending or change in direction of light when it travels from one medium into another is called
 a. refraction b. apparent depth c. total internal reflection d. dispersion

2.

The angle between the refracted ray and the normal is called the
 a. index of refraction b. critical angle c. angle of refraction d. total internal reflection

3.

Which of the following is a true statement regarding light?
 a. Light bends toward the normal when the speed of light in the second medium is greater. b. The speed of light is always the same, regardless of the medium through which it is passing. c. When it slows down in a medium, light bends away from the normal. d. Light can undergo partial reflection and refraction at the same time.

4.

The ratio of the speed of light in a vacuum to the speed of light in a medium is called the
 a. total internal reflection b. apparent depth c. index of refraction d. dispersion

5.

If the index of refraction for ice is 1.31, about what is the speed of light in ice?
 a. 1.24 ´ 108 m/s b. 2.01 ´ 108 m/s c. 2.26 ´ 108 m/s d. 2.29 ´ 108 m/s

6.

When light is travelling more slowly in the first medium than in the second, and the angle of incidence is greater than the critical angle, what occurs?
 a. refraction b. total internal reflection c. mirage d. dispersion

7.

Which of the following media has the highest index of refraction?
 a. air b. ice c. pure water d. diamond

8.

The critical angle is the angle of incidence for which the angle of refraction is
 a. 0° b. 45° c. 90° d. 180°

9.

What is the speed of light in a vacuum?
 a. 1.00 ´ 108 m/s b. 1.76 ´ 108 m/s c. 2.26 ´ 108 m/s d. 3.00 ´ 108 m/s

10.

If the speed of light in an unknown material is 1.69 ´ 108 m/s, what is the material’s index of refraction?
 a. 1.31 b. 1.46 c. 1.52 d. 1.78

11.

All of the following products make use of total internal reflection, except
 a. complex periscopes b. binoculars c. mirrored sunglasses d. fibre-optic cables

12.

The critical angle for glass is about
 a. 41.1° b. 48.8° c. 90.0° d. 180.0°

13.

A pair of binoculars uses two
 a. concave mirrors b. convex mirrors c. plane mirrors d. prisms

14.

Retro-reflectors are used for all of the following, except
 a. binoculars b. bike reflectors c. paint on road signs d. reflective strips on clothing

15.

Which of the following statement(s) accounts for the Sun having a flattened appearance near sunset?
 a. When the Sun is close to the horizon, light from the bottom of the Sun is refracted more than light from the top of the Sun. b. The increased density of air closer to Earth results in greater bending of the Sun’s rays. c. The light rays from the bottom of the Sun have a greater angle of incidence than the light rays from the top of the Sun. d. all of the above

16.

The separation of white light into its constituent colours is called
 a. refraction b. total internal reflection c. mirage d. dispersion

17.

Which of the following colours is refracted the most when it enters a prism?
 a. red b. green c. blue d. violet

18.

As a result of the refraction of light, objects in water appear to be
 a. deeper than they really are b. at a shallower depth than they really are c. larger than they really are d. smaller than they really are

19.

Shimmering is caused by
 a. light from the bottom of the Sun being refracted more through Earth’s atmosphere than light from the top of the Sun b. light travelling at slightly different speeds through air layers of different temperatures c. the difference in the depth that an object appears to be at due to the refraction of light in a transparent medium and the actual depth of the object d. the refraction of sunlight and partial internal reflection in water droplets in Earth’s atmosphere

20.

When light travels through two media and the speed of light in the second medium is less than the speed of light in the first medium, light
 a. bends toward the normal b. bends away from the normal c. acts unpredictably d. continues in a straight path