list two essential conditions to observe rainbow

Dear student, 
Please find below the solution to the asked query 

Rainbow forms when sunlight hits the water droplets suspended in the atmosphere and undergoes total internal reflection. When the sunlight comes out of the drop it disperses, where the drop acts like a small prism. This dispersion or breaking up of light into several colors is what forms the Rainbow. Hence, rainbow is an example of dispersion of sunlight.
Conditions for rainbow formation are:
1. A rain shower must have occurred  so that there is enough moisture in atmosphere.
2. The sun should be in the opposite direction.


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