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JEE Main & Advanced Physics Question Bank Human Eye and Lens Camera

  • question_answer
    A person uses a lens of power + 3D to normalise vision. Near point of hypermetropic eye is         [CPMT 2002]

    A)            1 m                                           

    B)            1.66 m

    C)            2 m                                           

    D)            0.66 m

    Correct Answer: A

    Solution :

                       Focal length of the lens \[f=\frac{100}{3}cm\]                    By lens formula \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]            \[\Rightarrow \frac{1}{+100/3}=\frac{1}{v}-\frac{1}{-25}\Rightarrow v=-100\ cm=-\ 1\ m\]


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