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A rainbow is an optical and meteorological phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
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Rainbow is formed when sunlight passes through the water droplets during rain,and these light split up into seven colors forming a band like structure.
In this case water acts as prism and reflects seven colors ( VIBGYOR)
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