Question: I1 3. [ Given a plane wave with wavenumber k in a medium, show that the phase difference between point A and point B along
I1

3. [ Given a plane wave with wavenumber k in a medium, show that the phase difference between point A and point B along the propagation direction is given by Ap = k,OPL, where ko is the vacuum wavenumber and OPL is the optical path length between the two points. /Hint: since the two points are along the propagation direction, the displacement vector FAB = FB - TA is parallel to the k-vector]
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