Question

guess and write why the rainbow appears semicircular on sky

Answer 1

Hey mate it occurs semicircular because we half of it only but it's in full circle.

Answer 2

A rain droplet is round, the light passing through follows its circular shape. All rainbows are actually full circles, but most people only ever see an arc or semicircle because they are standing on the ground and the other half is cut off by the horizon that's why it happens...
HOPE IT HELPED YOU
Be BRAINLY ✌️✌️