What makes a rainbow?
Rainbow's Secret Angles
What makes a rainbow?

You look up after a storm, and there it is — a giant glowing arc stretched across the sky, impossibly bright, impossibly perfect. Where did all those colors come from?
The answer starts with something invisible: white sunlight isn't really white. It's actually a mix of every color of light smooshed together — red, orange, yellow, green, blue, violet, all traveling in one beam. Your eyes can't tell them apart when they're bundled up like that, so you just see "white."
