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I've read here that microwaves are blocked by the holes in a microwave window because the holes on the door are small enough to prevent the microwaves from passing through. However, if wavelength is only the distance between successive crests of a wave, why should that decide what a certain wave can fit through? Why is amplitude not the deciding factor and is there a way to explain this visually?

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  • $\begingroup$ It has to do with boundary conditions (you can use simple optics and things like the single- and double-slit concepts) and interference, which only "allow" certain wavelengths to pass through. $\endgroup$ – honeste_vivere Jan 1 '17 at 17:17

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