- 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 denser than Y and ray BC travels faster than AB.
B) Medium X is optically denser than Y and ray BC travels slower than AB.
C) Medium X is optically less dense than Y and ray BC travels slower 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) a change in velocity of the light.
B) the absorption of light.
C) the reflection of light.
D) a change in colour 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) 45o
B) 90o
C) 0o
D) 180o
- 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) B
D) C
- 5. A light ray in water is incident onto a spherical air bubble as shown. Which of the following represents the emergent ray?
A) D
B) A
C) C
D) B
- 6. Total internal reflection can take place in glass and not in air because glass is
A) optically less dense than air.
B) optically denser than air.
C) less transparent than air.
D) more transparent than air.
- 7. Which of the following correctly shows the critical angle, c, of the semi-circular piece of glass?
A) D
B) A
C) C
D) B
- 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) B
B) C
C) A
D) D
- 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 plastic surface disperses the light.
C) The critical angle for plastic is greater than that for glass.
D) Plastic cannot totally reflect light.
- 10. Which of the following will affect the optical density of a glass block?
A) The type of glass.
B) The shape of the glass block.
C) The thickness of the glass block.
D) The angle of incidence and angle of refraction.
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