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

  • question_answer
    Velocity of light in glass whose refractive index with respect to air is 1.5 is \[2\times {{10}^{8}}m/s\] and in certain liquid the velocity of light found to be \[2.5\times {{10}^{8}}m/s\]. The refractive index of the liquid with respect to air is [CPMT 1978; MP PET/PMT 1988]

    A) 0.64                                          

    B) 0.80

    C) 1.20                                          

    D) 1.44

    Correct Answer: C

    Solution :

    \[\mu \propto \frac{1}{v}\Rightarrow \frac{{{\mu }_{l}}}{{{\mu }_{g}}}=\frac{{{v}_{g}}}{{{v}_{l}}}\Rightarrow \frac{{{\mu }_{l}}}{1.5}=\frac{2\times {{10}^{8}}}{2.5\times {{10}^{8}}}\Rightarrow {{\mu }_{l}}=1.2\]


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