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Coherent sources

It is found that when waves from two identical coherent sources superpose at a certain point, then the resultant intensity is equal to the intensity of one wave only. This means that the phase difference between the two waves at that point is


Resultant intensity  =4a2cos2δ/2a2  individual intensity

cos2δ/2=14        δ/2=60o      δ=120o=2π3     

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