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If the refractive index of the material of a prism is ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 2 A cot , where A is the angle of prism then angle of minimum deviation will be -

1. 2 π –2A
2. π – 2A
3. 2 π – A
4. π – A

Correct answer: π – 2A

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