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21 June, 16:31

What happens when white light shines onto a red filter?

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  1. 21 June, 19:48
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    The dye in between the two pieces of glass in the filter absorbs all the other colors in the white light except the red, and the red is the only light left to come out the other side. That's why the filter usually looks kind of red. It's also a big part of the reason why we call it a "red filter".
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