Angle of a prism is \( 30^{\circ} \) and its refractive index is \( \sqrt{2} \) and one of the s...

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Angle of a prism is \( 30^{\circ} \) and its refractive index is \( \sqrt{2} \) and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path?
(A) \( 30^{\circ} \)
(B) \( 45^{\circ} \)
(C) \( 60^{\circ} \)
(D) \( \sin ^{-1} \sqrt{1.5} \)
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