- electromagnetic radiation whose wavelength enables it to be detected by an unaided human eye. The interval of wavelengths so detectable spans from approximately 750 nanometers (red) to approximately 400 nanometers (violet). Light is currently defined as traveling at 2.99792458 × 108 meters per second. Also called visible light, light (1), or light radiation.
- synonym visible light
Not what you were looking for?