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

  • question_answer
    The ratio of angle of minimum deviation of a prism in air and when dipped in  water will be (\[_{a}{{\mu }_{g}}=3/2\] and \[_{a}{{\mu }_{w}}=4/3\])

    A)            1/8

    B)            1/2

    C)            3/4

    D)            1/4

    Correct Answer: D

    Solution :

               \[\frac{{{\delta }_{w}}}{{{\delta }_{a}}}=\frac{{{(}_{w}}{{\mu }_{g}}-1)}{{{(}_{a}}{{\mu }_{g}}-1)}\]\[=\frac{\left( \frac{9}{8}-1 \right)}{\left( \frac{3}{2}-1 \right)}=\frac{1}{4}\]


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