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

  • question_answer
    A man can see only between 75 cm and 200 cm. The power of lens to correct the near point will be

    A)            + 8/3 D                                    

    B)            + 3 D

    C)            ? 3 D                                        

    D)            ? 8/3 D

    Correct Answer: A

    Solution :

                       For improving near point, convex lens is required and for this convex lens                    \[u=-\,25\ cm,\] \[v=-\,75\ cm\]                    \[\therefore \frac{1}{f}=\frac{1}{-75}-\frac{1}{-25}\Rightarrow f=\frac{75}{2}cm\]            So power \[P=\frac{100}{f}=\frac{100}{75/2}=+\frac{8}{3}D\]


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