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A prism having refractive index sqrt(2) ...

A prism having refractive index `sqrt(2)` and refracting angle `30^(@)`, has one of the refracting surfaces polished. A beam of monochromatic light incident on the other refracting surface will retrace its path if the angle of incidence is

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The correct Answer is:
`45^(@)`
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RESNICK AND HALLIDAY-GEOMETRICAL OPTICS : REFRACTION-Problems
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