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Manipal Medical Manipal Medical Solved Paper-2014

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

    A) 15cm                                        

    B) -15cm

    C) 10cm                                        

    D) zero

    Correct Answer: B

    Solution :

    Given \[u=-30\] cm and \[v=-10\] cm \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]  \[=\frac{1}{-10}-\frac{1}{-30}=-\frac{2}{30}\]  \[\frac{1}{f}=-\frac{1}{15}\]  \[f=-15\,cm\] Minus sign signifies that lens used is concave.


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