If the refractive index of crown glass is 1.51, its critical angle is?
- 48.6°
- 22.5°
-
41.5°
- 45.0°
The correct answer is: C
Explanation
Sin c = (1)/n
= (1)/1.51 = 0.6622
∴ c = sin-\(^1\) 0.6622 = 41.47
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