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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2008

  • question_answer
        White light is incident on one of the refracting surfaces of a prism of angle\[5{}^\circ \]. If the refractive indices for red and blue colours are 1.641 and 1.659 respectively, the angular separation between these two colours when they emerge out of the prism is

    A)  \[0.9{}^\circ \]                                 

    B)  \[0.09{}^\circ \]

    C)  \[1.8{}^\circ \]                                 

    D)  \[1.2{}^\circ \]

    Correct Answer: B

    Solution :

                    Angular dispersion, \[{{\delta }_{b}}-{{\delta }_{r}}=({{\mu }_{b}}-{{\mu }_{r}})A\]                 \[=(1.659-1.641)5{}^\circ \]                 \[=0.09{}^\circ \]


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