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.
Sources of Visible Light Visible light comprises only a tiny portion of the entire electromagnetic spectrum of radiation. The wavelengths that the human eye can typically visualize lie between 400 and 700 nanometers in length, as illustrated in Figure 1.ources of Visible Light Visible light comprises only a tiny portion of the entire electromagnetic spectrum of radiation. The wavelengths that the human eye can typically visualize lie between 400 and 700 nanometers in length, as illustrated in Figure 1.