the discussions about the assumptions that the way which interference with one another are mono chromatic have a single frequency it is required that they are infinite in time.
This is not however I that practical unnecessary.
Two identical web of interference infinite durations whose frequency is fixed over that period will give rise to an interference pattern while they overlap.
two identical wires which consists of a narrow spectrum so frequency waves of infinite durations will keep a series of fringe pattern of slightly different situations and providing the spread of spacings is significantly less than the average range is kissing a fringe pattern will again be observed during that time when the two wave overlap.
conventional light source assignment so observe different frequency and at a different type of different. Is a source.
if the light split into two waves then we removed each individual lights web Mein generate an interference pattern with its other help out the individual print pattern generated will have different phases and spacing send normal Innova difference between will be observable.
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