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White light contains all colors. When white light passes through red glass, for example

(or any red thing that passes light through it), all of the colors except red are removed

(filtered out) so the resulting light only contains the color red.

This is a big part of the reason why that piece of glass comes to be called "red" glass.

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βˆ™ 11y ago
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βˆ™ 15y ago

The red is absorbed and all the other colours are reflected so it appears red

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Q: Why colour of light become red when it passes through red colour?
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