JoinScience 101? What Causes Rainbows?
If you look at a rain cloud with the Sun behind your back, the sunlight and water drops may interact just right, revealing the familiar arc of red, orange, yellow, green, blue, indigo, and violet. Many of us have been pleasantly surprised to see a rainbow in the sky, but probably haven't considered why they occur. Scientist John Beck demystifies this natural spectrum spectacle.