A rainbow is an optical and meteorological phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun. Rainbows can be full circles, however, the average observer sees only an arc, formed by illuminated droplets above the ground. In a "primary rainbow", the arc shows red on the outer part and violet on the inner side. Source
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