After a rainy day (which can be a little bit frustrating ) you look up to the sky and their it is, with all its colors beautifying the sky as it curves from one end to the other.
But why are they always curved?
- The rainbow is circular because when a raindrop bends light, the light exits the raindrop at an angle 40 to 42 degrees away from the angle it entered the raindrop. and regarding full circular rainbow, But if the sun is very low in the sky, either just before sunset or just after sunrise, we can see a half circle
- It only involves sunlight, water, and your eye. So there's no reason that the Earth being flat or curved ought to change the shape of a rainbow. The reason a rainbow is circular is that a circle is the set of all points in the sky that make the same angle between you, the water droplets, and the sun. Source-quora
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