Question

How rainbow is formed

Answer 1

When the rain is there and the sun is also there.
When the sun rays fall on the rain water. It make the look like the seven colour in the sky and that is rainbow

Answer 2

Water droplet acts as a prism. When a light or sunlight passes through the rain drop or water droplet then it undergoes refraction then dispersion. After dispersion it undergoes to Total internal reflection. And again refraction. Then it comes out of the water droplet or rain drop as a dispersion means came out as splitting into seven colours i.e. 

Violet, Indigo, Blue, Green, Yellow, Orange and Red. (VIBGYOR)

These colors reach the eyes of the observer and he/she can easily saw the rainbow...

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The phenomenon involved in it are :-

1) Refraction

2) Total internal reflection

3) Dispersion

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Condition necessary to see rainbow are :-

1) Recent rain.

2) Sun must be behind the observer.

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