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In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact,

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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? 

(1) 180° 

(2) 0° 

(3) Equal to angle of incidence 

(4) 90°

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1 Answer

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Best answer

The correct option is (4) 90°.

Explanation:

At i = ic, refracted ray grazes with the surface. 

So angle of refraction is 90°.

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