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The refracting angle of a prism is A and...

The refracting angle of a prism is A and refractive index of material of prism is cot `(A)/(2)`. The angle of minimum deviation is

A

`180^(@) - 2 A`

B

`180^(@) - 3A`

C

`180^(@) + 2A`

D

`90^(@) - A`

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