Answer:
We see a rainbow in the sky only
after rainfall due to dispersion of sunlight by tiny water droplets, present in
the atmosphere due to rainfall.
The water droplets act like small
prisms, they refract and disperse the incident sunlight, then reflect it
internally and finally refract it again when it comes out of the raindrop and hence
due to dispersion of light and internal reflection, rainbow formation takes
place during rainfall.
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