Kaner Sharma , asked a question
Subject: Science , asked on 7/2/13

 why the rainbow is in semi circle? why cant be a circle?

Nikita , added an answer, on 7/2/13
136 helpful votes in Science

 it is a full circle, because the perfectly spherical water droplets in the air split the white sunlight into the spectrum which you see as a rainbow. The light comes in at an angle, and then reflects out at an angle. From your perspective on the ground, that angle exsists in a full 360 degree arc - a circle. You only see a semi-circle because either the earth gets in the way of seeing the rest, or because there isn't sufficient water suspended in the atmosphere to see the whole thing.


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