how come clear plastic sheets (folder wallet things to hold paper) are clear on their own but once you stack them up they become more opaque ?
In: Physics
They’re only *mostly* clear. If something is even 99.9% clear, then stacking a bunch of them together will block 0.1% more light with each additional one you add to the stack.
It’s the same reason that on a foggy morning, everything around you is always clear but it’s foggy further away. The air everywhere is *mostly* clear so when you’re looking at things close to you (through just a few “layers” of fog) everything is clear, but when you look down at the end of the block (through many more “layers” of fog), everything there is foggy.
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