If one face of a prism of prism angle \( 30^{\circ} \) and \( \mu=\...

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If one face of a prism of prism angle \( 30^{\circ} \) and \( \mu=\sqrt{2} \) is silvered, the incident ray retraces its initial path. What is the angle of incident?
\( \mathrm{P} \)
(A) \( 90^{\circ} \)
(B) \( 180^{\circ} \)
W
(C) \( 45^{\circ} \)
(D) \( 55^{\circ} \)
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