What are coherent sources of light ? Why nointerference pattern is observed when two coherent sources are (i) too close (ii) very far apart ?
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The source of light which emit light waves of same wavelenth, same frequency and in same phase or having a constant phase difference are called coherent sources. (i) When these sources are too close, distance `(d)` betwee them tends to zero. Fringe width `beta = (lambda D)/(d)` tends to infinity. Hence no interference pattern will be observed. (ii) When distance `(d)` between them becomes too large, fringe width `beta` becomes too small and may no longer be in the visible region. Hence no interference pattern will be observed.
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