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Punjab Medical Punjab - MET Solved Paper-2003

  • question_answer
    Two thin lenses of powers \[12\,\,D\] and \[-2\,\,D\] 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                 \[P={{P}_{1}}+{{P}_{2}}=12-2=10\,\,D\] Focal length\[f=\frac{1}{P}=\frac{1}{10}m=0.1\,\,m\] The combined lens will be convex (convergent)


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