Question

why are the rainbows circular?​

Answer 1

Answer:

The glory of a circular rainbow

This is called a glory, which NASA defines as an optical phenomenon that "looks like small, circular rainbows of interlocking colors." This glory was photographed from a plane over South Africa.

If we draw rays of sunlight that reflect at 42 degrees into your eyes then those rays start to look like they form a circular arc in the sky. So the reflection gives you the shape of the rainbow, while the refraction gives you the colours of the rainbow. ... From the air you can see circular rainbows.

Explanation:

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Answer 2

Explanation:

• First, look for a rainbow when the sun is behind you, and there are raindrops falling in front of you.
• Second, know that – when making the rainbow – sunlight is emerging from many raindrops at once. A rainbow isn’t a flat two-dimensional image on the dome of sky. It’s more like a mosaic, composed of many separate bits … in three dimensions. More about the three-dimensional quality of rainbows below. Just know that your eye sees rainbows as flat for the same reason we see the sun and moon as flat disks, because, when we look in the sky, there are no visual cues to tell us otherwise.
• Third, rainbows are more than half circles. They’re really whole circles. You’ll never see a circle rainbow from Earth’s surface because your horizon gets in the way. But, up high, people in airplanes sometimes do see them. Check out the photo below.

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