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JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
                                           A convex lens produces a real image m times the size of the object.  What will be the distance of the object from the lens [JIPMER 2002]

    A)            \[\left( \frac{m+1}{m} \right)f\]                                      

    B)            (m ?1)f

    C)            \[\left( \frac{m-1}{m} \right)f\]                                       

    D)            \[\frac{m+1}{f}\]

    Correct Answer: A

    Solution :

               \[m=\frac{f}{f+u}\Rightarrow -\,m=\frac{f}{f+u}\Rightarrow u=-\left( \frac{m+1}{m} \right)f\]


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