Answers

2015-03-31T16:39:50+05:30
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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2015-03-31T16:47:06+05:30
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 :-
1)Refraction
2)Reflection

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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