Reflection & Refraction Quiz
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5 questions, one answer each
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1. What is the law of reflection?
- A. Angle of incidence equals angle of refraction
- B. Angle of incidence equals angle of reflection
- C. Angle of reflection is always 90°
- D. Angle of incidence is always greater than angle of reflection
2. A ray of light passes from air into a glass block. Which way does it bend?
- A. Towards the normal, because it slows down
- B. Away from the normal, because it slows down
- C. Towards the normal, because it speeds up
- D. It does not bend at all
3. A ray of light hits a glass-to-air boundary at an angle of incidence equal to the critical angle. What happens to the refracted ray?
- A. It bends towards the normal
- B. It travels exactly along the boundary at 90° to the normal
- C. It is completely absorbed
- D. It splits into two rays
4. A ray of light travels from glass (n = 1.5) towards air at an angle of incidence greater than the critical angle. What happens?
- A. The light refracts out into the air as normal
- B. The light is totally internally reflected back into the glass
- C. The light is absorbed by the glass
- D. The light travels straight through undeviated
5. Glass has a refractive index of 1.5. What is its critical angle (to the nearest degree)?
- A. 30°
- B. 42°
- C. 48°
- D. 60°