what is the units used for measuring light wavelengths
The longer wavelengths (red) and the shorter wavelengths (blue) are separated. Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400â700 nanometres, or 4.00 Ã 10â7 to 7.00 Ã 10â7 m, between the infrared and the ultraviolet. This wavelength means a frequency range of roughly 430â750 terahertz. The main source of light on Earth is ...