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Physics Question on Ray optics and optical instruments

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

A

equal to angle of incidence

B

90∘90^\circ

C

180∘180^\circ

D

0∘0^\circ

Answer

90∘90^\circ

Explanation

Solution

At i=ici = i_c, refracted ray grazes with the surface.
So angle of refraction is 90∘90^{\circ}