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JIPMER Jipmer Medical Solved Paper-2004

  • question_answer
    Two thin lenses of powers 12 D and -2D respectively are placed in contact, the power   focal   length   and   nature respectively will be:

    A)  8 D, 0.8 m, convex         

    B)         14 D, 0.5 m convex

    C)         5 D, 0.2 m, convex

    D)         10 D, 0.1 m, convex

    Correct Answer: D

    Solution :

    Given : \[{{P}_{1}}=12D,\]\[{{P}_{2}}=-\,2D\] Power of combination \[P={{P}_{1}}+{{P}_{2}}=12-2=10D\] Focal length \[f=\frac{1}{P}=\frac{1}{10}m=0.1\,m\] The combined lens will be convex (convergent)


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