If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
-
30o
- 42o
- 45o
- 50o
The correct answer is: A
Explanation
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)c = sin-1\((\frac{1}{n})\)
= 30o