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JIPMER Jipmer Medical Solved Paper-1996

  • question_answer
    In a photometer two sources of light when placed at distances 20 cm and 30 cm respectively produce shadows of equal intensities. Their luminous intensities are in the ratio of;

    A) \[{{\left( \frac{2}{3} \right)}^{1/2}}\]           

    B)                         \[2/3\]                

    C)  \[4/9\]                                

    D)         none of the above

    Correct Answer: C

    Solution :

    Dimension intensity \[\propto \] (distance)2 \[I\propto {{d}^{2}}\] Hence     \[\frac{{{I}_{1}}}{{{I}_{2}}}={{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{2}}={{\left( \frac{20}{30} \right)}^{2}}=\frac{4}{9}\] Hence,  \[{{I}_{1}}:{{I}_{2}}=4:9\]


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