Cod liver oil - a potentially toxic source of Vitamin A: Hypervitaminosis A can result from ingestion of too much vitamin A from diet, supplements, or prescription medications.
This visible light region consists of a spectrum of wavelengths that range from approximately 700 nanometers (abbreviated nm) to approximately 400 nm. Expressed in more familiar units, the range of wavelengths extends from 7 x 10 -7 meter to 4 x 10 -7 meter.
Visible light is usually defined as having wavelengths in the range of 400â700 nanometres (nm), or 4.00 Ã 10 â11 to 7.00 Ã 10 â11 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths). This wavelength means a frequency range of roughly 430â750 terahertz (THz).ike all types of light, visible light is emitted and absorbed in tiny packets called photons, and exhibits properties of both waves and particles. This property is referred to as the waveâparticle duality.