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VMMC VMMC Medical Solved Paper-2015

  • question_answer
    A crown glass prism is combined with flintone to produce a hybrid optical appratus in such a way that the mean by passes undeviated. If crown prism is of angle 5°, then angle of the flint glass prism will be (for crown and flint glasses the refractive indices are 1.517 and 1.620, respectively).

    A) 5°                           

    B) 4°    

    C) 7°                           

    D) 9°

    Correct Answer: B

    Solution :

    The deviation produced by crown prism is \[\delta =(\mu -1)A\]and that by flint glass is \[\delta '=(\mu '-1)A'\]In case of no net deviation\[\delta =\delta '\]                     \[A'=\left[ \frac{(\mu -1)}{(\mu '-1)} \right]A=\frac{1.517-1}{1.620-1}\times {{5}^{o}}\]\[=4.2\simeq {{4}^{o}}\]


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