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Question

In total reflection when the angle of incidence is equal to the critical angle then angle of refraction is?

A

Equal to angle of incidence

B

$$90^o$$

C

$$180^o$$

D

$$0^o$$

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Solution

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Correct option is D. $$90^o$$
At $$i = i_c$$, refracted ray grazes with the surface.
So angle of refraction is $$90^o$$.

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