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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 8

  • question_answer
    A light ray is incident perpendicular on one face of a \[90{}^\circ \] prism and is total internally reflected at the glass-air interface. If the angle of reflection is \[45{}^\circ \], we conclude that (the refractive index of glass is n).

    A) \[n<\sqrt{2}\]

    B) \[n>\sqrt{2}\]

    C) \[n<\sqrt{\frac{3}{2}}\]

    D) None of these

    Correct Answer: B

    Solution :

    [b] \[45{}^\circ >C\] \[\sin 45{}^\circ >\sin \,C=n\,\,sin\,\,C=1\] \[\sin 45{}^\circ >\frac{1}{n}\] \[n>\sqrt{2}\]


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