Why does a rainbow have exactly seven colors?
This story is from 2026-09-05. It is preserved in the archive; the latest stories are on the live feed.
Short answer: it doesn't, really — and the number seven has almost nothing to do with physics. When Isaac Newton first split sunlight with a prism in the 1660s, he only identified five colors: red, yellow, green, blue, and violet. Ten years later, he added two more — orange and indigo — specificall…
Read the full story at DEV Community — AI ↗
Timeline · 1 report
- 2026-09-05 18:48 · DEV Community — AI
Why does a rainbow have exactly seven colors?