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

  • question_answer
    A man can see clearly up to 3 metres. Prescribe a lens for his spectacles so that he can see clearly up to 12 metres [DPMT 2002]

    A)            ? 3/4 D                                    

    B)            3 D

    C)            ? 1/4 D                                    

    D)            ? 4 D

    Correct Answer: C

    Solution :

                       For lens u = wants to see = ? 12 cm v = can see = ? 3 m \[\therefore P=\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[\Rightarrow P=\frac{1}{-3}-\frac{1}{(-12)}=-\frac{1}{4}D\]


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