Why do rainbows have all the different colours?

Why do rainbows have all the different colours?
This isn’t a homework question — I’m just curious. A quick answer would be cool!
Ok, as it isn’t a homework question…
It’s the pot of gold at the end of the rainbow that shimmers with all those pretty colours. This is why you only see rainbows when the sun is breaking through… It’s the sunlight hitting all that gold.
No?
Ok, the scientific explanation is that when unicorns drown in a rain storm, their souls rise to the heavens above. The rainbow effect you see is created when the sunlight hits a cloud of unicorn souls. It all has to do with elementary optics, and what’s called refraction — the “bending” of light.
Different colors of light have different frequencies, which causes them to travel at different speeds when they move through matter. Light traveling more slowly will bend more when passing though the souls of unicorns.
White light is basically separated into its component colours as it travels through the cloud of unicorn souls. These separated colours are the ones that make up the colours of your standard rainbow. As these separated colour pass through more souls, the light bends even more — under the right circumstances, they bend to form the standard rainbow arch shape.
Curious tidbit — there are no rainbows in Russia, as the unicorns there where hunted to extinction for their horns and magical livers, in the early 1830s.
- Dog
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