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     EduGorilla 
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    A parallel beam of light is incident from air at an angle  on the side PQ of a right-angled triangular prism of refractive index n =. Light undergoes total internal reflection in the prism at the face PR when  has a minimum value of 45o. The angle  of the prism is:

    Options :-

    1. 15o
    2. 22.5o
    3. 30o
    4. 45o
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