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Answers
a). rainbow formation is the phenomenon occur in the above diagram
b). It is the combined effect of dispersion, refraction and total international reflection of light.
d). Rainbow is a beautiful natural
phenomenon. It is the combined effect of a
number of natural processes. It is the combined
effect of dispersion, refraction and total internal
reflection of light. It can be seen mainly after a
rainfall. Small droplets of water act as small
prisms. When light rays from the Sun enter
these droplets, it gets refracted and dispersed.
Then there is internal reflection as shown in
the figure, and after that once again the light
gets refracted while coming out of the droplet.
All these three processes together produce the
rainbow
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