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

  • question_answer
    The optical path of a monochromatic light is same if it goes through 4.0 cm of glass or 4.5 cm of water.  If the refractive index of glass is 1.53, the refractive index of the water is [UPSEAT 2002]

    A)            1.30                                          

    B)            1.36

    C)            1.42                                          

    D)            1.46

    Correct Answer: B

    Solution :

                       Optical path \[\mu x=\]constant i.e. \[{{\mu }_{1}}{{x}_{1}}={{\mu }_{2}}{{x}_{2}}\]            \[\Rightarrow \] \[1.53\times 4={{\mu }_{2}}\times 4.5\Rightarrow {{\mu }_{2}}=1.36\]


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