Answer:
Fringe width, \[\beta =\frac{D\lambda }{d}\] (i) As\[\beta \propto D,\], so when screen is moved away from the slits, fringe width increases. (ii) As\[\beta \propto 1/d,\] so when the separation between he slits is increased, fringe width decreases. (iii) When widths of slits are doubled, contrast between maxima and minima decreases due to the overlapping of interference patterns formed by various narrow pairs of the two slits.
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