Question

why is a rainbow formed in the shape of a arc​

Answer 1

Answer:

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.

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Answer 2

A rainbow needs two things to be formed. They are water droplets and sunlight. Under the right conditions, each water droplet acts like a prism. This means that when a beam of sunlight hits the droplet, two things can happen: the light will simply pass through, or it will bend, bounce off the surface, and then bend again as it comes out, dispersing the white light into the seven visible colors that make up every rainbow.

A rainbow is not actually shaped like a semicircle or an arc; that is simply the shape that we see. In fact, a rainbow is a circle, but we can’t see the full shape because the horizon cuts off the lower half. However, if you were flying high enough, without any disturbance, then you would be able to see a full rainbow.

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