The refractive index of glass with respect to air is 2. Then the critical angle of glass - air interface is

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$0^{0}$

$45^{0}$

$60^{0}$

$30^{0}$

answer is C.

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Detailed Solution

$n_{2} \sin i = n_{1} \sin r n_{1} = 1 n_{2} = 2 r = 90^{0} \Rightarrow 2 \times \sin i = 1 \times \sin 90 \Rightarrow 2 \times \sin c = 1 \times 1 \Rightarrow \sin c = \frac{1}{2} \Rightarrow c = 30^{0}$

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