Technology2 mins ago
Rainbows
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Why is a rainbow curved?
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For more on marking an answer as the "Best Answer", please visit our FAQ.Raindrops are spherical and therefore symmetrical. Light passing through a drop is diffracted like light passing through a prism, but because the drops are symmetrical, light is scattered forming a circle of colours, hence the curve. If it wasn't for the ground getting in the way we would see the whole circle, not just a semi-circle, and in the right conditions complete circular rainbows can be seen, they're called halos.