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     EduGorilla 
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    For an isosceles prism of angle A and refractive index , it is found that the angle of minimum deviation = A. Which of the following options is/are correct?

    Options :-

    1. At minimum deviation, the incident angle i1 and the refracting angle r1 at the first refracting surface are related as r1 = .
    2. For this prism, the refractive index  and the angle of prism A are related as A = .
    3. For the angle of incidence i1 = A, the ray inside the prism is parallel to the base of the prism.
    4. For this prism, the emergent ray at the second surface will be tangential to the surface when the angle of incidence at the first surface is i1 = sin–1 .
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