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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2005

  • question_answer
    A convex lens makes a real image of 4 cm long   on a screen. When the km is shifted to a new position without disturbing the object or the screen, we get a real image on the screen, which is 16 cm long. The length of the object is:

    A)  1/4 cm                

    B)         8 cm

    C)  20 cm                  

    D)         2 cm

    Correct Answer: B

    Solution :

    From displacement method, the length of object is given by \[O=\sqrt{{{I}_{1}}{{I}_{2}}}=\sqrt{4\times 16}=\sqrt{64}=8\,cm\]


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