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

  • question_answer
    The ratio of thickness of plates of two transparent mediums A and B is 6 : 4.  If light takes equal time in passing through them, then refractive index of B with respect to A will be [UPSEAT 1999]  

    A)            1.4

    B)            1.5

    C)            1.75                                          

    D)            1.33

    Correct Answer: B

    Solution :

                       Time taken by light to travel distance x through a medium of refractive index \[\mu \] is            \[t=\frac{\mu x}{c}\Rightarrow \frac{{{\mu }_{B}}}{{{\mu }_{A}}}=\frac{{{x}_{A}}}{{{x}_{B}}}=\frac{6}{4}\Rightarrow {{\,}_{A}}{{\mu }_{B}}=\frac{3}{2}=1.5\]


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