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Question: The refractive angle of a prism is A and the refractive index is cotA/2. The minimum deviation is-...

The refractive angle of a prism is A and the refractive index is cotA/2. The minimum deviation is-

A

1800 – 3 A

B

1800 + 2A

C

900 – A

D

1800 – 2A

Answer

1800 – 2A

Explanation

Solution

m = =

sin = sin

\ = 900 =

dm = 1800– 2A