The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium
-
A.
68o -
B.
56o -
C.
34o -
D.
18o
Correct Answer: Option C
Explanation
c = (sin^{-1} frac{1}{n} = sin^{-1} frac{1}{1.8} = 34^o)