Refraction of Light Quiz
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5 questions, one answer each
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1. Which of the following correctly defines the angle of incidence?
- A. The angle between the incident ray and the normal to the surface
- B. The angle between the incident ray and the surface itself
- C. The angle between the refracted ray and the normal to the surface
- D. The angle through which the light ray bends
2. Light travels from water into air. What happens to the light ray at the boundary?
- A. It bends towards the normal because air has a higher refractive index
- B. It bends away from the normal because air has a lower refractive index
- C. It continues straight without bending
- D. It bends towards the normal because water has a higher refractive index
3. The refractive index of glass is 1.5. Calculate the critical angle for light travelling from glass to air.
- A. 32°
- B. 42°
- C. 48°
- D. 58°
4. In an experiment to investigate refraction using a transparent block, a student observes that at a certain angle of incidence, the refracted ray travels along the boundary between the glass and air. What is this angle called?
- A. The angle of refraction
- B. The critical angle
- C. The angle of deviation
- D. The normal angle
5. Optical fibres are used in telecommunications because light can travel through them over long distances with minimal loss. Which physical principle allows this to happen?
- A. Refraction of light at the fibre boundaries reduces signal loss
- B. Total internal reflection confines light within the fibre core
- C. The refractive index of the fibre material is very low
- D. Light undergoes constructive interference within the fibre