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

  • question_answer
    A spectrum is formed by a prism of dispersive power \['\omega '\]. If the angle of deviation is \['\delta '\], then the angular dispersion is                                     [MP PMT 1989]

    A)            \[\omega /\delta \]          

    B)            \[\delta /\omega \]

    C)            1/\[\omega \delta \]        

    D)            \[\omega \delta \]

    Correct Answer: D

    Solution :

                       We know that \[\frac{{{\delta }_{v}}-{{\delta }_{r}}}{{{\delta }_{mean}}}=\omega \]            \[\Rightarrow \] Angular dispersion = \[{{\delta }_{v}}-{{\delta }_{r}}=\theta =\omega {{\delta }_{mean}}\]


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