Why Does Diffraction Occur Even When Wavelength Exceeds Aperture Width?

In summary: But if the wavelength is much smaller than the slit, that central beam is very narrow--not spread out much."...does the central beam still exist at all if the wavelength is much smaller than the slit? I mean if it's not spreading out much, wouldn't it be essentially just a point?
  • #71
Actually what I meant is if the source is right in the wall then isn't it sort of like already being diffracted through a single slit? The waves would be parallel(wavelength perpendicular) to the left/right slit. In this case the waves shouldn't pass through should they?
 

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