Chromatic Aberration

• Lenses bend different colors of light through different angles, just as a prism does

• As a result, different colors do not focus at the same point, and stars viewed through a telescope that uses a simple lens are surrounded by fuzzy, rainbow-colored halos

• If the telescope designer carefully chooses two different kinds of glass for two lenses that make up the one, different colors of light can be brought to a focus at the same point