Why the total internal reflection takes place in rain drop and not in

1.	Why the total internal reflection takes place in rain drop and not in glass
Answer» The formation of a rainbow involves a series of physical phenomena - reflection, refraction, dispersion and total internal reflection. The occurence of each of these is due to the interaction of light with air and water and the boundaries between them. As light enters the raindrop, it is refracted (the path of the light is bent to a different angle), and some of the light is reflected by the internal, curved, mirror-like surface of the raindrop, and finally isrefracted back out the raindrop toward the observer.

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