a point sources produce a spherical wave the light from the two point sources of all updates insurance portal maps out the way in who is this phase difference between the two waves very innerspace this depend on the wavelength and their separation of the light of success the figure of the light shows interference between the two spherical wave and the Wave length increases from the top to bottom and the distance between the sources from the left to right.
when the plane of observation is foreigner up away the fringe pattern will be a series of almost straight line since they will then be almost planner.
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