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CMC Medical CMC-Medical VELLORE Solved Paper-2012

  • question_answer
    A man can see only between 75 cm to 200 cm. The power .of lens to correct the near point will be

    A)  \[-3D\]                

    B)  \[-\,8/3D\]

    C)  \[+3D\]                               

    D)  \[+\,8/3D\]

    Correct Answer: D

    Solution :

                    For Improving near point, a convex lens is required and for this convex lens. u = - 25 cm and v = - 75 cm \[\therefore \] \[\frac{1}{f}=\frac{1}{-75}-\frac{1}{-25}\Rightarrow f=\frac{75}{2}cm\] \[\therefore \]Power, \[P=\frac{100}{f}=\frac{100}{72/2}=+\frac{8}{3}D\]


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