1.

A ray of light from a denser medium strikes at the interface of a rarer medium at an angle of incidence i. If the reflected and refracted rays are mutually perpendicular to each other, then the critical angle is

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A ray of light from a denser medium strikes at the interface of a rarer medium at an angle of incidence i. If the reflected and refracted rays are mutually perpendicular to each other, then the critical angle is



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