Answers

2016-01-06T20:23:49+05:30
The reason a rainbow is a smooth curve is because it is the *angle* between the light incident on a raindrop, and the light exiting the raindrop, that determines what color is seen. And, as you note, it also depends on the fact that raindrops are, on average, roughly spherical.

or i think so earth is in sphere shape so it is coming like semicircle

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U had seen in internet
yeah
Ok
ok means for what
2016-01-06T20:36:50+05:30
A rainbow is curved because of the way that light shines - it forms into a curved shape. 
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