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rainbow is formed by the sun light reflecting off from water drops and scattering the colors


Formation of rainbow is an application of scattering of light.When there is raining then the sunlight is scattered by the water droplet.As a result White light of sun is spreed in air in seven colour and we call that as rainbow.
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Rainbow is formed by the dispersion of sunlight.It usually appears after the rain.In the formation of rainbow many phenomenon occurs at a same time. These are as follows :-

When the sunlight is passed through or go into the suspended particles in the atmosphere internal refraction take place and causes a band of seven colours called rainbow.And when these rays come into our eyes we can able to see a rainbow. 

Note = A rainbow always forms on the opposite side of the sun.
Here , raindrop acts like a small prism.
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