Question 31
Refraction of LightFrom the diagram above, calculate the incident angle i.
- A.41°.
- B.49°.
- C.55°.
- D.61°.
Show the answer and explanation
Answer: D (61°.)
Explanation
The refracted ray runs along the boundary, so i is the critical angle for glass to water: sin i = 1.33 ÷ 1.52 ≈ 0.875, giving i ≈ 61°.