11 questions linked to/from Diffraction by small holes
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### What happens in a microwave oven with hole in the shielding?

We have a question on cooking asking about the safety of a microwave with a hole in it. The question isn't totally clear whether the hole has actually penetrated shielding or just the plastic wall of ...
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### Does diffraction happen from small slit width than its wavelength? [duplicate]

I always learnt in school that diffraction and interference happens if the slit width is of the order of wavelength. But what if the slit width is less than that of wavelength. Does diffraction ...
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### What happens to the diffraction pattern of light as an aperture becomes infinitely small?

Will the point source according to Huygens principle start radiating backwards with nothing to cancel it out? Will it be a complete sphere if light passes through an infinitely small aperture?
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### Microwave Oven Mesh Screen

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 ...
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### How can radiation be a transverse wave? Does light really resemble a rope? How can a 3D field be a medium for non-spatial 1D waves? Need mental model

I understand longitudinal waves. For example, I've got a clear mental modal of air waves: a slice of air becomes overcompressed, then the slice next to it becomes overcompressed and the first slice ...
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### What happens to waves when they hit smaller apertures than their wavelenghts?

I was wondering this for quite a long time now. Let's say you have a water wave (like ripples, not the ones you see during tsunamis) with wavelength 10 m. Imagine you put a boundary with an opening of ...
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### Why there is no diffraction in the microwave oven's door? [duplicate]

I thought that hole smaller than wavelength causes strong diffraction. Holes in door of the microwave oven 100 times smaller than wavelength. Why does it block radiation?
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### 2.4Ghz microwaves have a 12cm wavelength. How do microwave ovens leak radiation, since any gap in the shielding is much smaller than that wavelength?

I've read (I think on wikipedia, but I can't find the reference) that microwave oven leakage is often due to faulty seals on the door. Given that any gap in the door is going to be far smaller than 10%...
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### Physical reason why the wavelength defines the minimum sized opening an electromagnetic wave can pass through? [duplicate]

I'm having a hard time understanding why wavelength restricts a wave from passing through a hole smaller than that wavelength. For example on a microwave, the front grating prevents the microwaves ...