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

  • question_answer
    A beam of monochromatic blue light of wavelength \[4200\,{AA}\] in air travels in water (\[\mu =4/3\]). Its wavelength in water will be                                                         [MNR 1991; UPSEAT 2000]

    A) \[2800\,\,{AA}\]               

    B) \[5600\,\,{AA}\]

    C) \[3150\,\,{AA}\]               

    D) \[4000\,\,{AA}\]

    Correct Answer: C

    Solution :

    \[\mu \propto \frac{1}{\lambda }\] Þ  \[\frac{1}{4/3}=\frac{x}{4200}\Rightarrow x=3150\] \[{AA}\]


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