Prism whose refractive index is cot(A/2): angle of minimum deviation

1. A.
   $180 - 2\text{ }A$
2. B.
   $90 - A$
3. C.
   $180 + 2\text{ }A$
4. D.
   $180 - 3\text{ }A$

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1. A.
   $\pi - 2\text{ }A$
2. B.
   $\frac{\pi}{2} - 2\text{ }A$
3. C.
   $\pi - A$
4. D.
   $\frac{\pi}{2} - A$

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1. A.
   $\delta_{m} = 180^{\circ} - A$
2. B.
   $\delta_{m} = 180^{\circ} - 3\text{ }A$
3. C.
   $\delta_{m} = 180^{\circ} - 4\text{ }A$
4. D.
   $\delta_{m} = 180^{\circ} - 2\text{ }A$

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