why their are only 7 colours in rainbow
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Because a white and black colour contains with seven colours and when we reflect it on a mirror we can see white colour and when it's rain the droups of water act as a mirror.
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Some say it has less than seven. Namely, not everyone accepts indigo (between blue and violet) as a separate color, so many learn the rainbow has six colors. ... Here's how rainbows work: the water droplets act like a prism, refracting the white light from the sun and spreading it into its many parts.
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