NEET Sample Paper NEET Sample Test Paper-32

  • question_answer The power of an achromatic convergent lens of two lenses is\[+2D\]. The power of convex lens is\[+5D\]. The ratio of dispersive power of convex and concave lens will be :-

    A)  \[5:3~\]

    B)  \[3:5\]

    C)  \[\text{2}:5\]               

    D)  \[5:2\]

    Correct Answer: B

    Solution :

    \[{{P}_{1}}+{{P}_{2}}=2D\] and \[{{P}_{1}}=5D\], so \[{{P}_{2}}=-3D\] For achromatic combination \[\frac{{{\omega }_{1}}}{{{\omega }_{2}}}=\left( -\frac{{{P}_{2}}}{{{P}_{1}}} \right)=\left( \frac{-3}{5} \right)=\frac{3}{5}\]

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