Question

In which conditions does a rainbow form? Why?

Answer 1

a rainbow forms when light passes through a rain drop.as when light passes then,raindrop acts like a prism.
we know that when whit light passes through prism then 7 colours appear similar with this case
hence there should be some sunlight and rain drops also

Answer 2

Answer:

A rainbow is caused by sunlight and atmospheric conditions. Light enters a water droplet, slowing down and bending as it goes from air to denser water. The light reflects off the inside of the droplet, separating into its component wavelengths--or colors. When light exits the droplet, it makes a rainbow.