![]() ![]() Visible wavelengths pass largely unattenuated through the Earth's atmosphere via the " optical window" region of the electromagnetic spectrum. Colors containing only one wavelength are also called pure colors or spectral colors. Unsaturated colors such as pink, or purple variations like magenta, for example, are absent because they can only be made from a mix of multiple wavelengths. The spectrum does not contain all the colors that the human visual system can distinguish. The optical spectrum is sometimes considered to be the same as the visible spectrum, but some authors define the term more broadly, to include the ultraviolet and infrared parts of the electromagnetic spectrum as well. Under optimal conditions these limits of human perception can extend to 310 nm ( ultraviolet) and 1100 nm ( near infrared). These boundaries are not sharply defined and may vary per individual. In terms of frequency, this corresponds to a band in the vicinity of 400–790 terahertz. A typical human eye will respond to wavelengths from about 380 to about 750 nanometers. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |