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A prism has a refracting angle of $60^{\circ} .$ When placed in the position of minimum deviation, it produces a deviation of $30^{\circ} .$ The angle of incidence is
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The correct answer is:
$45^{\circ}$
$i=\frac{A+\delta_{m}}{2}=\frac{60+30}{2}=45^{\circ}$
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