Light is electromagnetic radiation, particularly radiation of a wavelength that is 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 is referred to as the wave-particle duality. The study of light, known as optics, is an important research area in modern physics.

Davies, H. (n.d.). Light sources. EBME.



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