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A prism of refractive index sqrt(3/2) an...

A prism of refractive index `sqrt(3/2)` and refracting angle is `45^(@)` is placed in air. One of the two refracting surface of the prism is silvered and a ray of monochromatic light enters the prism from the other face at an angle `theta`. If the ray retraces its path, then what is the value of `theta` (in degree)?

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