Answer:
Fringe width, \[\beta =\frac{D\lambda }{d}\] i.e., \[\beta \propto \frac{1}{d}\] (i) When the two coherent sources are placed infinitely close to each other, the fringe width becomes very large. Even a single fringe may occupy the entire screen. The interference pattern is not observable. (ii) As the distance between the sources is increased, the fringe width goes on increasing. At very large separation, it becomes too small to be detected. The interference pattern cannot be observed.
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