Question

why does rainbow is in arc shape​

Answer 1

$\huge\mathfrak\red{hello}$

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 arcin the sky. So the reflection gives you theshape of the rainbow, while the refraction gives you the colours of the rainbow. ... From the air you can see circularrainbows.

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Answer 2

Answer:

Because The air in the atmosphere is filled with raindrops .each raindrops acts like a tiny prism.If sunlight passes through raindrops at just the right angle, the light is split into an arc of colors with red on the outside of the band and violet on the side