Light's electromagnetic radiation, particularly radiation of a wavelength that's visible to the human eye (about 400–700 nm), or perhaps 380–750 nm. In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. Three primary properties of light are: Intensity Frequency or wavelength Polarization Light, which exists in tiny "packets" called photons, exhibits properties of both waves and particles. This property's referred to a… (More on Light)