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Write the relation between path differen...

Write the relation between path difference and phase difference?

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Phase difference `(phi)`: It is the difference expressed in degress or radians between two waves having same frequency and referenced to same point in time.
Path difference `delta)`: It is the difference between the lenghts of two paths of the two different having same frequency and travelling at same velocity. `delta=(lambda)/(2pi)phi`
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