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BCECE Engineering BCECE Engineering Solved Paper-2005

  • question_answer
    In Youngs double slit experiment, the slit width and the distance of slits from the screen both are doubled. The fringe width:

    A)  increases

    B)         decreases

    C)         remains unchanged

    D)         none of the above

    Correct Answer: C

    Solution :

    Distance between two adjacent bright (or dark) fringes is called the fringe width. It is denoted by\[\beta ,\] thus, \[\beta =\frac{D\lambda }{d}\] where D is the distance between slit source and screen and d is separation of slits. Since, D and d are increased to same extent, so fringe width (w) will remain unchanged.


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