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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2006

  • question_answer
    White light is incident on one of the refracting surfaces of a prism of angle \[{{5}^{o}}\]. If the refractring 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)  \[{{0.9}^{o}}\]                                 

    B)  \[{{0.9}^{o}}\]

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

    D)  \[{{1.2}^{o}}\]

    Correct Answer: B

    Solution :

    Angular dispersion,                 \[{{\delta }_{b}}-{{\delta }_{r}}=({{\mu }_{0}}-{{\mu }_{r}})A\]                                 \[=\,(1.659-1.641){{5}^{o}}\]                                 \[={{0.09}^{o}}\]


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