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

  • question_answer
    The respective angles of the flint and crown glass prisms are A? and A. They are to be used for dispersion without deviation, then the ratio of their angles A' /A will be [MP PMT 1989]

    A)            \[-\frac{({{\mu }_{y}}-1)}{({{\mu }_{y}}'-1)}\]           

    B)            \[\frac{({{\mu }_{y}}'-1)}{({{\mu }_{y}}-1)}\]

    C)            \[({{\mu }_{y}}'-1)\]          

    D)            \[({{\mu }_{y}}-1)\]

    Correct Answer: A

    Solution :

               Since \[A({{\mu }_{y}}-1)+{A}'({{\mu }_{y'}}-1)=0\Rightarrow \frac{{{A}'}}{A}=-\left( \frac{{{\mu }_{y}}-1}{{{\mu }_{y'}}-1} \right)\]


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