A prism of refractive index \( \sqrt{2} \) has a refracting angle o...

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A prism of refractive index \( \sqrt{2} \) has a refracting angle of \( 30^{\circ} \). One of the refracting surfaces of the prism is polished. For the beam of monochromatic light to retrace its path, find the angle of incidence on the
\( \mathrm{P} \) refracting surface.

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