Can you explain the science behind how a rainbow is formed?

[Chris914]

How is a rainbow formed? Is it a series of droplets that refract the light to our eyes, or is it multiple droplets at different heights where each droplet gives just one color that's visible to us?

 

[Simon Bridge]

Sounds like homework to me.
It's both. Have you tried looking it up?

 

[adjacent]

http://en.wikipedia.org/wiki/Rainbow

 

[dauto]

How is one choice different from the other? May be you should explain the question a bit better. As written they seem both correct.