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JEE Main & Advanced Physics Question Bank Prism Theory and Dispersion of Light

  • question_answer
    A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerges normally from the opposite surface. If the refractive index of the material of the prism is \[\mu \], the angle of incidence i is nearly equal to [CBSE PMT 1992]

    A)            A /\[\mu \]                           

    B)            \[A/2\mu \]

    C)            \[\mu A\]                              

    D)            \[\mu A/2\]

    Correct Answer: C

    Solution :

                       Since the ray emerges normally, therefore \[e=0\].                    According to relation \[A+\delta =i+e\], we get \[i=A+\delta \].            Hence by \[\delta =(\mu -1)A\], we get \[i=\mu A\].


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