Question

how rainbow forms after rainfalls ?​

Answer 1

Answer:

After it rains, the air in the atmosphere is filled with raindrops. Each raindrop 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 inside

Answer 2

Answer:

When water reacts with sunlight then it's form rainbow. sunlight is made up of seven different colours. Newton's disc is an experiment to prove that sunlight is made up of seven different colours.