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The refractive index of a prism with ape...

The refractive index of a prism with apex angle `A` is `cot A//2`. Prove that the angle of minimum deviation is `delta_m = (180^@ - 2 A)`.

A

`delta_(m)=180^(@)-2A`

B

`delta_(m)=180^(@)-4A`

C

`delta_(m)=180^(@)-3A`

D

`delta_(m)=180^(@)-A`

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A
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