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NEET Sample Paper NEET Sample Test Paper-25

  • question_answer
    A person who can see things most clearly at a distance of 10 cm requires spectacles to enable to him to see clearly things at a distance of 30 cm. What should be the focal length of the spectacles.

    A)  15 cm (Concave)

    B)  15 cm (Convex)

    C)  10 cm

    D)  0

    Correct Answer: A

    Solution :

     For lens u = wants to see = -30 cm and v = can see = -10 cm \[\therefore \]\[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}=\frac{1}{-10}-\frac{1}{(-30)}\] \[\Rightarrow \]\[f=-15\,cm\]


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