I was looking at my microwave the other day and I thought that the metal mesh screen might be acting like a set of perpendicularly oriented polarizers. Other explanations I've heard on how this screen blocks out radiation seem to hinge on the wavelength of microwaves being large enough that the spacing of the mesh screen effectively looks like a solid screen to incoming microwaves. Is it accurate to think of the mesh screen like a set of polarizers? If not then could the metal mesh screen be replaced by a mesh of any arbitrary material and still block out radiation?
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