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The refracting angle of a prims is A,and...

The refracting angle of a prims is A,and refraction index of the material of the prism is cot `(A//2)`The angle of minimum deviation is

A

`180^@-2A`

B

`90^@-A`

C

`180^@+2A`

D

`180^@-3A`

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