eli5:Why light can go through paper, but can’t through walls?
In: Physics
Well walls are a lot thicker than paper, and so there’s physically many more atoms in the way and many more chances to absorb incoming light.
Lets say that material absorbs 90% of incoming light per milimeter.
A piece of paper that’s less than a millimeter will still transmit a lot of light. A chunk of the same material a centimeter thick will block all incoming light.
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