Question 30
Refraction of LightIf the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?
- A.sin−1 ½
- B.sin−1 ⅔
- C.sin−1 ¾
- D.sin−1 8/9.
Show the answer and explanation
Answer: B (sin−1 ⅔)
Explanation
sin C = 1/n = 1/1.5 = 2/3, so C = sin−1(2/3).