- Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared (with longer wavelengths and lower frequencies) and the ultraviolet (with shorter wavelengths and higher frequencies), called collectively optical radiation.
- Ms. Pac-Man (Atari 2600) (Internet Archive)
In 1981, a sequel to Pac-Man was introduced in the form of his girlfriend, Ms. Pac-Man. This sequel continued on the “eat the dots/avoid the ghosts” gameplay of the original game, but added new features to keep the title fresh.