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  4. 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 ?

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Q. 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 ?

NEETNEET 2019Ray Optics and Optical Instruments

Solution:

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

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