Revision - Chapter 13 + 14

A 60^o glass prism disperses white light as shown.

• A.   violet, green, blue, yellow, orange, red

• B.   violet, blue, green, orange, yellow, red

• C.   violet, blue, green, yellow, orange, red

• D. violet, green, blue, orange, yellow, red

A teacher has a clock mounted in such a way that students can only see its reflection in a plane mirror.

The diagram shows the reflection of the clock.

What time is shown on the clock?

• A. 05:40

• B. 07:40

• C. 07:20

• D. 06:20

A composite block is made by joining together three transparent materials. The diagram shows a ray of light passing through the composite block.

Which list gives the three materials in order of the speeds of light in the materials, from slowest to fastest?

• 1 -> 2 -> 3

• 1 -> 3 -> 2

• 2 -> 1 -> 3

• 2 -> 3 -> 1

When light passes from a denser material into a less dense material

• light slows down and bends toward the normal

• light slows down and bends away from the normal

• light speeds up and bends toward the normal

• light speeds up and bends away from the normal

Identify the correct definition of the critical angle.

• The critical angle is the angle of incidence when the angle of refraction is exactly 90^o and light is refracted along the boundary

• The critical angle is the angle of refraction when the angle of incidence is exactly 90^o and light is refracted along the boundary

• The critical angle is the angle of incidence when the angle of reflection is exactly 90^o and light is reflected along the boundary

• The critical angle is the angle of incidence when the angle of refraction is exactly 90^o and light is reflected along the boundary

Which of the diagrams below shows both the correct position of the image, and the correct path the light rays must have taken to the eye?

• A

• B

• C

• D

Fill in the blank:

(a)   light is light of a single frequency.

Which diagram correctly shows the formation of a real image on a screen?

• A

• B

• C

• D

Below is a ray diagram showing the image formed by a thin, converging lens. Which of the following statements about the image is correct?

• The image is virtual and can be seen by eye Y.

• The image is inverted and can be seen by eye Y.

• The image is real and can be seen by the eye at X.

• The image is virtual and can be seen by eye X.

The diagram shows light passing from air into glass. A number of angles have been labelled on the diagram.

Which of the equations could be used to correctly calculate the refractive index, n, of the glass?

• sin P / sin S

• sin Q / sin R

• sin P / sin R

• sin Q / sin S