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JCECE Medical JCECE Medical 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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