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I heard that amplitude of secondary wavelet depends on obliquity factor but no one gave the complete description . What is dependence of secondary wavelet coming out of point source in Fraunhofer diffraction from a point source in slit as a function of angle from wavefront ? And why we consider slit in this case as a collection of infinite sources in this case but in YDSE two slits are considered as single source emanating wavelets , why there is not infinite no. of sources as both the slits are of same dimensions ?

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