Why do mountains look blue/purple from far away?
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It’s not mountains, it’s the air – it scatters light. Light is composed of range of different frequencies, each one having it’s own color. And highest frequencies (which is blue and violet) scattered the most. So, Sun’s light shining to the ground through air, and a bit of violet-blue-green colors are reflected from air mass to your eyes, adding blue/purple tint to anything further away.
This scattering is scientifically called Rayleigh scattering.
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