- 1. The diagram shows a ray of light AB striking the interface of medium X and medium Y. BC is the refracted ray. Which one of the following statements is correct?
A) Medium X is optically less dense than Y and ray BC travels slower than AB.
B) Medium X is optically denser than Y and ray BC travels slower than AB.
C) Medium X is optically denser than Y and ray BC travels faster than AB.
D) Medium X is optically less dense than Y and ray BC travels faster than AB.
- 2. When light passes from one medium into another, refraction occurs. This is because of
A) the absorption of light.
B) the reflection of light.
C) a change in colour of the light.
D) a change in velocity of the light.
- 3. A light ray does not bend at a boundary between two media of different optical densities if its angle of incidence is
A) 180o
B) 90o
C) 0o
D) 45o
- 4. A light ray travelling in glass strikes the glass-air boundary. Some light is reflected and some is refracted. Which diagram shows the paths of the rays?
A) D
B) A
C) C
D) B
- 5. A light ray in water is incident onto a spherical air bubble as shown. Which of the following represents the emergent ray?
A) A
B) D
C) C
D) B
- 6. Total internal reflection can take place in glass and not in air because glass is
A) less transparent than air.
B) more transparent than air.
C) optically less dense than air.
D) optically denser than air.
- 7. Which of the following correctly shows the critical angle, c, of the semi-circular piece of glass?
A) D
B) C
C) B
D) A
- 8. A prism is made from glass with a critical angle less than 45o. Which one of the following diagrams, showing light passing through the prism, is INCORRECT?
A) D
B) C
C) B
D) A
- 9. The figures show how the path of monochromatic ray of light differs when passed through two prisms. Why do the paths differ?
A) Plastic is more transparent than glass.
B) The critical angle for plastic is greater than that for glass.
C) Plastic cannot totally reflect light.
D) The plastic surface disperses the light.
- 10. Which of the following will affect the optical density of a glass block?
A) The angle of incidence and angle of refraction.
B) The type of glass.
C) The thickness of the glass block.
D) The shape of the glass block.
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