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

Question

$\delta_m=180^{\circ}-3 \mathrm{~A}$

$\delta_m=180^{\circ}-4 A$

$\delta_m=180^{\circ}-2 A$

$\delta_m=180^{\circ}-A$

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