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

  • question_answer
    At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object                                                                [J&K CET 2004]

    A)            30 cm                                      

    B)            60 cm

    C)            15 cm                                      

    D)            90 cm

    Correct Answer: D

    Solution :

                       \[m=-\frac{1}{2}\]            \[\therefore m=\frac{f}{u+f}\]\[\Rightarrow -\frac{1}{2}=\frac{30}{u+30}\]\[\Rightarrow u=\,-\,90\,cm\]


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