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NEET AIPMT SOLVED PAPER MAINS 2011

  • question_answer
    A thin prism of angle \[15{}^\circ \] made of glass of refractive index \[{{\mu }_{1}}=1.5\] is combined with another prism of glass of refractive index \[{{\mu }_{2}}=1.75.\]The combination of the prism produces dispersion without deviation. The angle of the second prism should be        

    A)  \[{{7}^{o}}\]                     

    B)  \[{{10}^{o}}\]

    C)  \[{{12}^{o}}\]

    D)  \[5{}^\circ \]

    Correct Answer: B

    Solution :

    For without deviation \[\frac{A}{A'}=\frac{\mu '-1}{\mu -1}\] \[\frac{{{15}^{o}}}{A'}=\frac{1.75-1}{1.5-1}\] \[\frac{15}{A'}=\frac{0.75}{0.50}\] \[A'=\frac{0.50\times 15}{0.75}={{10}^{o}}\]


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