Refraction and total internal reflection Quiz
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5 questions, one answer each
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1. Light travels at 1.24 × 10⁸ m s⁻¹ in a material. What is its refractive index?
- A. 0.41
- B. 1.24
- C. 2.42
- D. 3.72
2. A ray in air strikes water (n = 1.33) at 30°. What is the angle of refraction?
- A. 22°
- B. 40°
- C. 23°
- D. 30°
3. Which medium has the smallest critical angle against air?
- A. Water, n = 1.33
- B. Glass, n = 1.50
- C. Perspex, n = 1.49
- D. Diamond, n = 2.42
4. Light in glass (n = 1.50) hits a glass–air boundary at an angle of incidence of 38°. What happens?
- A. Total internal reflection
- B. Most of the light refracts into the air
- C. No light is reflected
- D. The light travels along the boundary
5. In the core practical, which graph gives the refractive index as its gradient?
- A. θ₂ against θ₁
- B. sin θ₁ against θ₂
- C. sin θ₁ against sin θ₂
- D. sin θ₂ against sin θ₁