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VERY IMPORTANT QUESTION. URGENT . The arrangement used by Thomas Young to produce an interference pattern is shown in the given diagram. Justify why there

would be no change in the ‘fringe width’ when the main illuminated slit (S) is shifted to the position any other position.


The fringe width B is given by :
where lambda is wavelength of light used
D is distance between slits and screen
d is distance between the two slits.
Thus it doesnt depend on the distance of source light and hence fringe width remains unchanged.
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