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BriO111
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I get that diffraction takes place when wavelength is smaller than slit size due to interference. I am confused though, if every point on the slit is taken as a new source when a wave passes through a slit, then surely, if the wave had a longer wavelength than the slit, then the let's say passing through coherent light would spread out without destructive interference but some partial construive intereference would still take place, causing diffraction?