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

  • question_answer
    A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm  [CPMT 1977; MP PET 1985, 88; MP PMT 1990]

    A)            + 3.0 D                                    

    B)            + 0.125 D

    C)            ? 3.0  D                                   

    D)            + 4.0 D

    Correct Answer: A

    Solution :

               \[P=\frac{1}{f}=-\frac{1}{v}+\frac{1}{u}=-\frac{1}{100}+\frac{1}{25}=\frac{3}{100}=+\ 3\ D\]


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