A prism having refractive index \( \sqrt{2} \) and refracting angle \( 30^{\circ} \), has one of...

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A prism having refractive index \( \sqrt{2} \) and refracting angle \( 30^{\circ} \), has one of the refracting surfaces polished. A beam of light incident on the other
\( \mathrm{P} \)
refracting surface will retrace its path if the angle of
W
incidence is:
(1) \( 0^{\circ} \)
(2) \( 30^{\circ} \)
(3) \( 45^{\circ} \)
(4) \( 60^{\circ} \)
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