A light ray is incident perpendicularly to one face of a ${90^ \circ }$ prism and is totally internally reflected at the glass-air interface. If the angle of reflection is ${45^ \circ }$, we conclude that the refractive index $n$

Question

$n > {1 \over {\sqrt 2 }}$

$n > \sqrt 2 $

$n < {1 \over {\sqrt 2 }}$

$n < \sqrt 2 $

Solution

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