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

  • question_answer
    In order to obtain a real image of magnification 2  using a converging lens of focal length 20 cm, where should an object be placed                                                         [AFMC 2004]

    A)            50 cm                                      

    B)            30 cm

    C)            ? 50 cm                                   

    D)            ? 30 cm

    Correct Answer: D

    Solution :

                       For real image \[m=-\,2\]            \[\therefore m=\frac{f}{u+f}\]\[\Rightarrow -\,2=\frac{f}{u+f}=\frac{20}{u+20}\]Þ u = ? 30 cm.


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