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JCECE Engineering JCECE Engineering Solved Paper-2009

  • question_answer
    An unpolarised beam of intensity \[{{I}_{0}}\] is incident on a pair of Nichols making an angle of \[{{60}^{o}}\] with each other. The intensity of light emerging from the pair is

    A) \[{{I}_{0}}\]                                       

    B) \[\frac{{{I}_{0}}}{2}\]

    C) \[\frac{{{I}_{0}}}{4}\]                                     

    D) \[\frac{{{I}_{0}}}{8}\]

    Correct Answer: C

    Solution :

    According to Malus' law                 \[I={{I}_{0}}{{\cos }^{2}}\theta \]                    \[={{I}_{0}}({{\cos }^{2}}{{60}^{o}})\]                    \[={{I}_{0}}\times {{\left( \frac{1}{2} \right)}^{2}}\]                    \[=\frac{{{I}_{0}}}{4}\]


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