Eli5 why rainbows appears in a curved shape? Why isn’t it just a random streak in the sky? What causes their signature curved look?

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Eli5 why rainbows appears in a curved shape? Why isn’t it just a random streak in the sky? What causes their signature curved look?

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All these answers have not quite pointed at the reason. It is because the sun is a point source of light, And your eye is a point of termination. So the arc is the intersection of two cones with vertices at the sun and at your eye.

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