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BVP Medical BVP Medical Solved Paper-2008

  • question_answer
    The ratio of intensity at the centre of a bright fringe to the intensity at a point distant one fourth of the distance between two successive bright fringes will be

    A) 4                                             

    B) 3

    C) 2                                             

    D) 1

    Correct Answer: C

    Solution :

                    Intensity at the centre of bright fringe, \[{{I}_{0}}=I+I+2\sqrt{I\,I}\cos {{0}^{o}}\] \[{{I}_{0}}=2I+2I\] \[{{I}_{0}}=4I\] Intensity at a point distant \[\beta /4\] (with a phase difference \[=2\pi /4=\pi /2\]) is                 \[I=I+2\sqrt{I\,\,I}\cos \frac{\pi }{2}\]                 \[I=2I+2\sqrt{I\,I}\times 0\]                 \[I=2I\] \[\therefore \]  \[\frac{{{I}_{0}}}{I}=\frac{4I}{2I}=2\]


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