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Rainbows are formed when sunlight is scattered from raindrops into the eyes of an observer. Most raindrops are spherical rather than the often depicted ‘teardrop’ shape and it is this spherical shape that provides the conditions for a rainbow to be seen.
Rainbows are formed when sunlight passes through raindrops in the air. Each raindrop acts like a tiny prism, bending and dispersing the sunlight into its constituent colors (red, orange, yellow, green, blue, indigo, violet). When many raindrops disperse sunlight at different angles, it creates a circular arc of colors in the sky that we see as a rainbow.
Rainbows are formed when sunlight is refracted, or bent, as it passes through raindrops. This bending splits the light into its component colors, which then reflect off the inside surface of the raindrop before emerging and creating a spectrum of colors in the sky.