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BHU PMT BHU PMT (Mains) Solved Paper-2009

  • question_answer
    In a Young's double slit experiment, the source slit S, and the two slits A and B are horizontal. With slit A above B, the fringes are observed on a vertical screen k. The optical path length from S to B is increased very slightly (by introducing a transparent material of higher refractive index) and the optical path length from S to A is not changed. As a result the fringe system on k moves

    A)  vertically downward slightly

    B)  vertically upwards slightly

    C)  horizontally slightly to the left

    D)  horizontally slightly to the right

    Correct Answer: A

    Solution :

                     If a transparent thin film of mica or glass is put in the path of one of the waves, then the whole fringe pattern gets shifted towards the slit in front of which glass plate placed.


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