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NEET Sample Paper NEET Sample Test Paper-80

  • question_answer
    If the refractive index of water is 4/3 and that of given slab of glass immersed in it is 5/3, what is the critical angle for a ray of light tending to go from glass to water?

    A)  \[{{\sin }^{-\,1}}\,\left( \frac{3}{4} \right)\]                   

    B)  \[{{\sin }^{-\,1}}\,\left( \frac{3}{5} \right)\]

    C)  \[{{\sin }^{-\,1}}\,\left( \frac{4}{5} \right)\]                   

    D)  Data given are insufficient to make any calculation

    Correct Answer: C

    Solution :

    Critical angle \[C={{\sin }^{-\,1}}\left( \frac{{{\mu }_{w}}}{{{\mu }_{g}}} \right)\,\,=\,\,{{\sin }^{-1}}\left( \frac{4/3}{5/3} \right)\] \[=\,\,\,{{\sin }^{-\,1}}\,\left( \frac{4}{5} \right)\]


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