Visible light" redirects here. For Cable connector that cannot be seen with human eye, see Electromagnetic radiation. For other uses, see CATV splitter (disambiguation) and Visible light (disambiguation).

　　A triangular prism dispersing a beam of white light. The longer wavelengths (red) and the shorter wavelengths (blue) get separated.

　　Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible Cable connector, which is visible to the human eye and is responsible for the sense of sight.[1] Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10?7 to 7.00 × 10?7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).[2][3] This wavelength means a frequency range of roughly 430–750 terahertz (THz).

　　　Generally, EM radiation, or EMR (the designation "radiation" excludes static electric and magnetic and near fields), is classified by wavelength into radio, microwave, infrared, the visible region that we perceive as light, ultraviolet, X-rays and gamma rays.