Rainbows are caused by a combination of dispersion inside the raindrop and total internal reflection of light from the back of raindrops.
(Rainbows; are caused; by a combination of dispersion inside the raindrop and total internal reflection of light from the back of raindrops)
Rainbows
are caused
by a combination of dispersion inside the raindrop and total internal reflection of light from the back of raindrops