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Manipal Engineering Manipal Engineering Solved Paper-2010

  • question_answer
    A convex lens is placed between object and a screen. The size of object is 3 cm and an image of height 9 cm is obtained on the screen. When the lens is displaced to a new position, what will be the size of image on the screen?

    A)  2 cm                                     

    B)  6 cm

    C)  4 cm                     

    D)         1 cm

    Correct Answer: D

    Solution :

    From displacement method size of object,\[O=\sqrt{{{I}_{1}}{{I}_{2}}}\] Here,     \[O=3\,\,cm,\,\,{{I}_{1}}=9\,\,cm\] \[\therefore \]  \[3=\sqrt{9{{I}_{2}}}\] or            \[{{I}_{2}}=1\,\,cm\]


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