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NEET Physics Wave Optics / तरंग प्रकाशिकी NEET PYQ-Wave Optics

  • question_answer
    Two Polaroids \[{{P}_{1}}\] and \[{{P}_{2}}\] are placed with their axis perpendicular to each other. Unpolarised light  \[{{l}_{0}}\] is incident on \[{{P}_{1}}\]. A third polaroid \[{{P}_{3}}\] is kept in between \[{{P}_{1}}\] and \[{{P}_{2}}\] such that its axis makes an angle \[{{45}^{o}}\] with that of \[{{P}_{1}}\]. The intensity of transmitted light through \[{{P}_{2}}\] is                                                                                                 [NEET-2017]

    A)  \[\frac{{{l}_{0}}}{16}\]                       

    B)       \[\frac{{{l}_{0}}}{2}\]

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

    D)       \[\frac{{{l}_{0}}}{8}\]

    Correct Answer: D

    Solution :

    [d]       
                \[{{l}_{2}}=\frac{{{l}_{0}}}{2}{{\cos }^{2}}{{45}^{o}}\]
    \[=\frac{{{l}_{0}}}{2}\times \frac{1}{2}\]
    \[=\frac{{{l}_{0}}}{4}\]
    \[{{l}_{3}}=\frac{{{l}_{0}}}{4}{{\cos }^{2}}{{45}^{o}}\]
    \[{{l}_{3}}=\frac{{{l}_{0}}}{8}\]


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