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Question

A light ray is incident perpendicular to a face of a 90 prism and is totally internally reflected at the glass – air interface. If the angle of reflection is 45, what can be concluded about the refractive index n?

A
n<12
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B
n<2
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C
n>12
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D
n>2
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Solution

The correct option is D n>2
Us ethe concepts of TIR and critical angle and find the answer to be n>2.
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