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J & K CET Medical J & K - CET Medical Solved Paper-2013

  • question_answer
    A person has a minimum distance of distinct vision as 50 cm. The power of lenses required to read a book at a distance of 25 cm is

    A)  3D                  

    B)  1D

    C)  2D                   

    D)  4D

    Correct Answer: C

    Solution :

     \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[=-\frac{2}{50}+\frac{1}{25}=\frac{-1+2}{50}\] \[\frac{1}{f}=\frac{1}{50}\] \[\Rightarrow \] \[f=50\,cm\] \[p=\frac{100}{50}=2D\]


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