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A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky when the sun shines onto droplets of moisture in the Earth's atmosphere. They take the form of a multi-coloured arc, with red on the outer part of the arc and violet on the inner section of the arc.
After the rain, small water particles are dispersed in the air. As the sunlight (white light) consists of seven colors, so when it passes through the water droplets, they are split up
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