Atmospheric optics

Air molecules scatter short-wavelength blue light far more than red light. Overhead, that makes the sky blue; at sunset the long light path removes blue and leaves red.

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Starter thread · AI-reviewed against its sources

Rainbows form when sunlight is refracted, reflected inside, and refracted again by water droplets, splitting it into colours seen only from the right position.

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Starter thread · AI-reviewed against its sources