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Question

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

A
0
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B
45
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C
30
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D
60
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Solution

The correct option is C 30
We know that the critical angle is given by:-

C=sin11μ where μ=refractive index of denser medium relative to rarer medium

Here, μ=2

Hence, C=sin112

C=30o

Answer-(C)

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