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The refractive index of a prism with apex angle A is cot . 2 A The angle of minimum deviation is :

1. δ m = 180° –A
2. δ m = 180° – 2A
3. δ m = 180° –4A
4. δ m = 180° – 3A

Correct answer: δ m = 180° – 2A

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