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JEE Main & Advanced AIEEE Solved Paper-2011

  • question_answer
    Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given four alternatives after the statements, choose the one that describes the statements. A thin air film is formed by putting the covex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (coNvex) surface and the bottom (glass plate) surface of the film. Statement-1:       When light reflects from the                                 air-glass plate interface, the reflected wave suffers a phase change of \[\pi \]. Statement-2:        The centre of the interference                                    pattern is dark.   AIEEE  Solved  Paper-2011

    A) Statement-1 is false, Statement-2 is true

    B) Statement-1 is true, Statement-2 is false

    C) Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1

    D) Statement-1 is true, Statement-2 is true and Statement-2 is not the correct explanation of Statement-1

    Correct Answer: D

    Solution :

                 The centre of interference pattern is dark, showing that the phase difference between two interfering waves is \[\pi \]. But this does not imply statement-1.


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