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

  • question_answer
    A ray of light is incident on the surface of separation of a medium at an angle \[45{}^\circ \] and is refracted in the medium at an angle \[30{}^\circ \]. What will be the velocity of light in the medium [AFMC 1998; MH CET (Med.) 1999]

    A) \[1.96\times {{10}^{8}}\] m/s                                           

    B) \[2.12\times {{10}^{8}}\] \[m/s\]

    C) \[3.18\times {{10}^{8}}\]\[m/s\]                                     

    D) \[3.33\times {{18}^{8}}\]\[m/s\]

    Correct Answer: B

    Solution :

    \[\mu =\frac{c}{v}=\frac{\sin i}{\sin r}=\frac{\sin {{45}^{o}}}{\sin {{30}^{o}}}\]            \[\Rightarrow \] \[v=\frac{3\times {{10}^{8}}}{\sqrt{2}}=2.12\times {{10}^{8}}\]\[m/s\]


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