Because white is the color of all-colors-combined, we literally call light of all colors together “white light”.
You’ve seen how light can hit a prism and separate out into a rainbow, you can also take a rainbow and condense it back into a beam of white light.
In the case of the fog, which is just clouds really, each tiny drop of water is acting as a prism collecting and scattering and randomizing the light into a crazy jumble of all colors together. The result is just a schmeer of white light.
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