Eli5 Why does the wavelength instead of the amplitude prevent some radiation from penetrating a small hole or screen?

Question

For examples the screen on a microwave that lets light through, but not microwaves. I am having trouble visualizing it.

In: 31

Answer 1

Wavelength is how big. Light (visible electromagnetic waves) is tiny and fits through the screen. Microwaves are larger and do not fit though the screen.

Amplitude is how many. And it’s not like electromagnetic waves can “clog” if too many try to pass through at the same time.