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A 0.10-mm-wide slit is illuminated by light of wavelength 589

A 0.10-mm-wide slit is illuminated by light of wavelength 589

A 0.10-mm-wide slit is illuminated by light of wavelength 589 nm. Consider a point P on a viewing screen on which the diffraction pattern of the slit is viewed; the point is at 30o from the central axis of the slit. What is the phase difference between the Huygens wavelets arriving at point P from the top and midpoint of the slit?

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