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Uttarakhand PMT Uttarakhand PMT Solved Paper-2008

  • question_answer
    When a ray of light enters from one medium to another, then its velocity in second medium becomes double. The maximum value of angle of incidence, so that total internal reflection may not take place will be

    A)  \[60{}^\circ \]           

    B)  \[180{}^\circ \]

    C)  \[90{}^\circ \]           

    D)  \[30{}^\circ \]

    Correct Answer: D

    Solution :

     \[\mu =\frac{{{v}_{rarer}}}{{{v}_{denser}}}=\frac{2}{1}\] \[\mu =\frac{1}{\sin C}=\frac{2}{1}\] \[\sin C=\frac{1}{2},C=30{}^\circ \]


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