Answers

2016-02-04T21:11:38+05:30
 a rainbow has 7 main colours. 
a rainbow is only formed in the presence of light and excessive amount of humidity like rain.
a rainbow can form in any light source like moonlight and in any time when humidity is slightly more like fog or after rain . 
some examples of rainbow are - moonbow , rainbow , etc
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2016-02-04T21:13:41+05:30
Dispersion
scattering of light
refraction in water drop
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