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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    A convex lens forms a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object or the screen, again real image is formed on the screen which is 16 cm long. The length of object is

    A)  8 cm  

    B)  10 cm

    C)  12 cm                                  

    D)  6 cm

    Correct Answer: A

    Solution :

                    \[O=\sqrt{{{I}_{1}}{{I}_{2}}}\] \[O=\sqrt{4\times 6}=\sqrt{64}=8\,cm\]


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