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Haryana PMT Haryana PMT Solved Paper-2004

  • question_answer
    A convex lens makes a real image of 4 cm long on a screen. When the lens 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 \[O=\sqrt{{{I}_{1}}{{I}_{2}}}=\sqrt{4\times 16}=\sqrt{64}=8cm\]


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