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JEE Main & Advanced Physics Ray Optics Question Bank Refraction of Light at Plane Surfaces

  • 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.  The refractive index of benzene is                                       [Pb. PMT 1999]

    A)            1.5

    B)            2.5

    C)            3.5 

    D)            4.5

    Correct Answer: B

    Solution :

               \[\mu =\frac{\text{Real depth}}{\text{apparent depth}}=\frac{120}{80}=1.5\]


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