Why do mountains look blue/purple from far away?
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The same reason the sky is blue. The more air that light has to travel through the shorter wave lengths get scattered. Violet/blue are the shortest wave lengths of color. When the sun is setting, the light goes through more atmosphere so longer wave lengths get scattered too like red and orange.
The distance the light has to travel between the mountain and your eyes is enough to scatter only the blue/violet light.
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