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JCECE Engineering JCECE Engineering Solved Paper-2011

  • question_answer
    A convex lens makes a real image \[4\,\,cm\] long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is \[16\,\,cm\] tall. The length of the object must be

    A) \[\frac{1}{4}cm\]                             

    B) \[8\,\,cm\]

    C)  \[12\,\,cm\]                     

    D)  \[20\,\,cm\]

    Correct Answer: B

    Solution :

    \[\theta =\sqrt{{{I}_{1}}{{I}_{2}}}\]                 \[=\sqrt{4\times 16}\]                 \[=8\,\,cm\]


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