1.

The refracting angle of prism is A and refractive index of material of prism is \[\cot \frac{A}{2}\]. The angle of minimum deviation is                                                                                                         [CPMT 1992]

A.            180°? 3A                                
B.            180° + 2A
C.            90° ?A                                     
D.            180° ? 2A
Answer» E.


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