Science Illustrated - - NATURE/ RAINBOW -

A rain­bow is pro­duced as a re­sult of re­frac­tion, re­flec­tion, and so colour dis­per­sion of sun­rays in mil­lions of wa­ter drops. The drops are cir­cu­lar rather than drop­shaped, as you might have thought. The rain­bow ap­pears as a shin­ing cir­cle in the sky, when we ob­serve fall­ing rain with the Sun be­hind us. The ob­server’s line of sight to a ran­dom point on the rain­bow produces a 42 de­gree an­gle with the di­rec­tion of the sun­light.

The ob­server only sees the light re­flected at a spe­cific an­gle from the rain­drops.

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