system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How does a microwave door keep microwaves from escaping?

I saw this question asked a couple years back, but no answer was really satisfactory and many were in contradiction.  Can we get a physicist to chime in on this, please?
gpt
The wavelength of microwaves is much larger than that of visible light, so they cannot fit through the holes in the mesh screen. To the microwaves the screen basically behaves as a solid sheet of metal.