[Phys-l] optics - diffraction?

["Paul Lulai" <plulai@stanthony.k12.mn.us>]

Hello.

Early on, I remember learning that single point diffraction patterns are (were?) the result of Huygen's principle.  Each infinitesimal point on the opening of the slit acted as a point source.  The interference pattern is (was?) the result of these multiple point sources within a single opening.

I've also heard hand-waving arguments stating that Huygen's Principle isn't correct.  This interference pattern is the result of something else. 

What is it if not Huygen's multiple point sources interfering with each other?

Paul Lulai
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