After it rains, the air in the atmosphere is filled with raindrops. Each raindrop acts like a tiny prism. If sunlight passes through raindrops at just the right angle, the light is split into an arc of colors with red on the outside of the band and violet on the inside.
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A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
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Answer:
After it rains, the air in the atmosphere is filled with raindrops. Each raindrop acts like a tiny prism. If sunlight passes through raindrops at just the right angle, the light is split into an arc of colors with red on the outside of the band and violet on the inside.