The Rainbow is a large spectrum of arc occurs due to refraction of light of the Sun by a grain of water. A rainbow is an optical and meteorological phenomena in the form of colourful interlocking parallel light appears in the sky or other medium. Rainbow in the sky, looked as the light arc with its end point on the horizon at a time of light rain. Rainbows can also be seen in the vicinity of torrential waterfalls.This phenomenon usually occurs when the air is very hot but light rain fell. We can see clearly this phenomenon, if we stand backs onto the light from the Sun. Rainbows may also form due to the foggy air or dewy.
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