Published: October 6, 2015
Total Running Time: 00:02:23
How can a CD split light into different colors? Our eyes can't tell the difference between a yellow light and one that's a mixture of red and green, but a spectroscope can—and the tiny grooves on the reflective side of a CD make a great spectroscope. Exploratorium Senior Scientist Paul Doherty explains what's going on when we make an outdated form of data storage into a powerful physics tool.