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

  • question_answer
    If the refractive indices of a prism for red, yellow and violet colours be 1.61, 1.63 and 1.65 respectively, then the dispersive power of the prism will be  [MP PET 1991; DPMT 1999]

    A)            \[\frac{1.65-1.62}{1.61-1}\]   

    B)            \[\frac{1.62-1.61}{1.65-1}\]

    C)            \[\frac{1.65-1.61}{1.63-1}\]   

    D)            \[\frac{1.65-1.63}{1.61-1}\]

    Correct Answer: C

    Solution :

               \[\omega =\frac{{{\mu }_{V}}-{{\mu }_{R}}}{{{\mu }_{Y}}-1}=\frac{1.65-1.61}{1.63-1}\]


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