BBC Future

How to create circular and double rainbows

What is a rainbow? Earth Unplugged reveals all by creating them, and explains why you never get to the end of one.

What is a rainbow? A rainbow is created when light refracts as it enters a raindrop. It then reflects off the back of the droplet and refracts again as it exits the water. This splits the colour spectrum and causes the rainbow to appear at 40-42 degrees at incoming light. It appears at this angle every time no matter where you stand or walk.

To show this Maddie Moate shows you how to create a single and a double rainbow, and then explains how rainbows are actually circular.

For more videos subscribe to the Earth Unplugged channel on YouTube.

If you would like to comment on this video or anything else you have seen on Future, head over to our Facebook or Google+ page, or message us on Twitter.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.