If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
-
A.
30o -
B.
42o -
C.
45o -
D.
50o
Correct Answer: Option A
Explanation
sin c = (frac{1}{n}) = (frac{1}{2})
c = sin-1((frac{1}{n}))
= 30o
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