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Solution


Q.

An equilateral prism is placed on a horizontal surface. A ray PQ is incident onto it. For minimum deviation                             [2004]
1 PQ is horizontal  
2 QR is horizontal  
3 RS is horizontal  
4 Any one will be horizontal  

Ans.

(2)

For minimum deviation, incident angle is equal to emerging angle. And ray QR inside the equilateral prism is parallel to base.