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Punjab Medical Punjab - MET Solved Paper-1999

  • question_answer
    A tank is filled with benzene to a height of\[120\,\,mm\]. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be\[80\,\,mm\]. Then the refractive index of benzene will be

    A) \[4.5\]                                  

    B) \[3\]

    C) \[.75\]                                  

    D) \[1.5\]

    Correct Answer: D

    Solution :

    Real depth\[{{d}_{1}}=120\,\,mm\] Apparent depth\[{{d}_{a}}=80\,\,mm\] Refractive index of benzene is given by \[\mu =\frac{real\,\,depth}{apparent\,\,depth}=\frac{{{d}_{1}}}{{{d}_{a}}}=\frac{120}{80}=1.5\]


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