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 refracting surface is seen to trace its path. What is the angle of incidence?
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