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NEET NEET SOLVED PAPER 2016 Phase-II

  • question_answer
    A person can see clearly objects only when they lie between 50 cm and 400 cm from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be

    A)  Convex, +2.25 diopter

    B)  Concave, \[-0.25\]diopter

    C)  Concave, \[-0.2\]diopter

    D)  Convex, + 0.15 diopter

    Correct Answer: B

    Solution :

    Maximum distance of distinct vision = 400 cm. So image of object at infinity is to be formed at 400 cm. Use lens formula \[\frac{1}{V}-\frac{1}{U}=\frac{1}{f}\] \[\frac{1}{-40}-\frac{1}{\infty }=\frac{1}{f}\]             P=-0.25D


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