The critical angle for two media of refractive indices of medium 1 and 2 given by 2 and 1 respectively is

The critical angle for two media of refractive indices of medium 1 and 2 given by 2 and 1 respectively is Correct Answer 30

The sine of the critical angle is the ratio of refractive index of medium 2 to that in medium 1. Thus sin θc = n2/n1. To get θc, put n1 = 2 and n2 = 1. Thus we get θc = sin-1(n2/n1) = sin-1(1/2) = 30 degree.
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