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The reason we call a blue filter a "blue filter" is that it looks blue. The reason

it looks blue is that blue light is the only kind of light that can go all the way

through it. Any other color of light gets absorbed in the dyes between the

layers of the filter, and never comes out the other side. If you shine red light

at one side of a blue filter, the other side of the filter looks dark, as if nothing

is shining through it. And if you look at a 'red' sweater through a blue filter, the

sweater looks black.

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13y ago

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