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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    The refractive index of water is 4/3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass?

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

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

    C)  \[{{\sin }^{-1}}\left( \frac{1}{2} \right)\]

    D)  \[{{\sin }^{-1}}\left( \frac{2}{1} \right)\]

    Correct Answer: A

    Solution :

     \[\mu =\frac{{{\mu }_{1}}}{{{\mu }_{2}}}=\frac{5/3}{4/3}=\frac{5}{4}\] \[\sin C=\frac{1}{\mu }=\frac{4}{5}\] \[C={{\sin }^{-1}}\left( \frac{4}{5} \right)\]


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