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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

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

    A)  \[3\,\,D\]                  

    B)  \[1\,\,D\]

    C)  \[2\,\,D\]                   

    D)  \[4\,\,D\]

    Correct Answer: C

    Solution :

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


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