Question

why rainbow is curved ?​

Answer 1

Answer:

curved shape is due to rays traveling towards the observer at an angle 42 degrees from the path of sunlight. secondary rainbows always form but can't usually see them, reflected twice in raindrop before exiting

Answer 2

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. ... From the air you can see circular rainbows.

HOPE IT HELPS..