system
Given the following post, respond as if you're commenting on Reddit:
human
At what size does a wire mesh stop acting as a Faraday cage?

Wire meshes can often be used as Faraday cages to shield the inside from exterior electromagnetic waves. At some point,  the mesh should stop being a Faraday cage if the holes keep getting bigger. So at what size of mesh does the mesh stop being effective at screening incoming waves?
gpt
Faraday cages stop being effective as the mesh size approaches the wavelength of light. For microwaves, notice that the protective wire mesh has mm-sized holes in it. If they were cm-sized, it wouldn't screen the microwaves as effectively.