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Solution


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         [2019]
1 90°  
2 180°  
3 0°  
4 equal to angle of incidence   

Ans.

(1)

When the angle of refraction is equal to 90°, the angle of incidence is called the critical angle.