Question

How are rainbows formed?
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Answer 1

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A rainbow is a multicolored arc made by light striking water droplets. The most familiar type rainbow is produced when sunlight strikes raindrops in front of a viewer at a precise angle (42 degrees). Light entering a water droplet is refracted. It is then reflected by the back of the droplet.

Answer 2

Answer:

Rainbows are formed when sunlight is scattered from raindrops into the eyes of an observer. ... The lower the sun in the sky the more of an arc of a rainbow the viewer will see. Rain, fog or some other source of water droplets must be in front of the viewer.