Why no interference pattern is observed when two coherent sources are infinitely close?
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Fringe width is inversely proportional to the distance (d) between the sources. When coherent sources are placed very close, fringe width is very large and a single fringe may occupy the whole field of view and the pattern would not be detected.
Similarly, if the coherent sources are far apart, fringe with will be very small and the pattern cannot be detected.
Explanation:
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