Question

♥ Hi mates. ♥ good morning ♥
♥ Here is my question ♥

Why is rainbow always in semicircle shape ?

Answer 1

The circle (or half-circle) results because there are a collection of suspended droplets in the atmosphere that are capable of concentrating the dispersed light at angles of deviation of 40-42 degrees relative to the original path of light from the sun.

Answer 2

the raindrop is round and so the light is round. The rainbow is formed in a full circle but most people see only semicircular part.