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 has wavelengths in the range of 4000â7000 Ã¥. The unit is named after the Swedish physicist Anders Jonas ÃngstrÃ¶m (1814â1874). The symbol is always written with a ring diacritic, as the letter in the Swedish alphabet.