The Science Behind Rainbows: Why Are They Always Semicircular?

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Unraveling the Rainbow's Mystery: Why it's Semicircular, Not Square!

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News18•05-03-2026, 22:06

Unraveling the Rainbow's Mystery: Why it's Semicircular, Not Square!

•Rainbows form when sunlight passes through raindrops, which act as small prisms, causing light to refract and reflect.
•The semicircular shape is due to light reaching our eyes at a specific 40-42 degree angle, with the Earth's horizon blocking the lower half.
•A rainbow is actually a complete circle, visible as such from high altitudes like planes or mountains.
•It's an optical illusion, not a physical object; its apparent movement is due to changing viewing angles.
•Rainbows are rarely seen at noon because the sun is directly overhead, causing the 42-degree angle to form below the ground.

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