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

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

Bihar CECEBihar CECE 2005Wave Optics

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.