Answer:
Fringe width, \[\beta =\frac{D\lambda }{d}\] Angular separation, \[\theta =\frac{\beta }{D}=\frac{\lambda }{d}\] (i) When the screen is moved away from the slits, the distance D increases. Fringe width \[\beta \] increases but angular separation \[\theta (=\lambda /d)\]remains unchanged. (ii) The interference pattern becomes less and less sharp. When the source slit becomes so wide that the condition \[\frac{s}{S}<\frac{\lambda }{d}\]is not satisfied, the interference pattern disappears. But the angular width \[\theta (=\lambda /d)\] remains unchanged.
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