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Solution


Q.

Find the value of the angle of emergence from the prism. Refractive index of the glass is 3.             [2021]
1 90°  
2 60°   
3 30°  
4 45°  

Ans.

(2)

Let ∠e is angle of emergence and ∠i is angle of incidence.

From Snell’s law at point P

     sinisinr=μaμg

      ∠i=30°

So,  sin30°sine=μaμg⇒sine=31×12⇒e=60°