Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2007

  • question_answer A person cannot see objects clearly beyond 50 cm. They power of the lens to correct the vision is

    A)  -5.0D                                   

    B)  -0.5D

    C)  +2D                                      

    D)  -2D

    Correct Answer: D

    Solution :

    Here \[v=-50\text{ }cm,\] \[v=\infty \] \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[=\frac{1}{-50}-\frac{1}{\infty }=-\frac{1}{50}\]                 \[\therefore \]  \[f=-50cm=-\frac{50}{100}m=-\frac{1}{2}m\] Power of the lens \[=\frac{1}{f}=-2D\]

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