Quote:
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Originally Posted by Jeff Root
To put it crudely: Are photons unable to squeeze through
small holes because they extend perpendicular to the direction
of motion, and so "bump into" the sides of the holes, or for
some other reason(s)?
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I would say that photons (and for that matter, all other particles) are unable to squeeze through small holes (or do squeeze through, but in surprising ways) because when the size of the hole becomes comparable to or smaller than the wavelength, they behave in a wavelike manner when passing through it, and not like small solid objects.