![]() The optical window is also referred to as the "visible window" because it overlaps the human visible response spectrum. An example of this phenomenon is when clean air scatters blue light more than red light, and so the midday sky appears blue (apart from the area around the Sun which appears white because the light is not scattered as much). 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. White light is dispersed by a prism into the colors of the visible spectrum. For The Dear Hunter album, see The Color Spectrum. For a list of Gig capable modems, visit /modem."Color spectrum" redirects here. Gig capable modem required for Gig speed. Available Internet speeds may vary by address. Enter your address to determine availability. Services subject to all applicable service terms and conditions, subject to change. General Terms: INTERNET: Speed based on wired connection and may vary by address. Taxes, fees and surcharges extra and subject to change during and after the promotional period installation/network activation, equipment and additional services are extra. Spectrum Internet® Gig promotion price is $89.99/mo standard rates apply after yr. ¶Limited time offer subject to change valid to qualified residential customers who have not subscribed to any services within the previous 30 days and who have no outstanding obligation to Charter. Spectrum Internet® Ultra promotion price is $69.99/mo standard rates apply after yr. ° Limited time offer subject to change valid to qualified residential customers who have not subscribed to any services within the previous 30 days and who have no outstanding obligation to Charter. Spectrum Internet ® promotion price is $49.99/mo standard rates apply after yr. § Limited time offer subject to change valid to qualified residential customers who have not subscribed to any services within the previous 30 days and who have no outstanding obligation to Charter. ![]() Account credentials may be required to stream some TV content online. Channel and HD programming availability based on level of service. ![]() General Terms: TV: TV equipment required charges may apply. Taxes, fees and surcharges (broadcast surcharge up to $21.00/mo) extra and subject to change during and after the promotional period installation/network activation, equipment and additional services are extra. Spectrum TV® Select promotion price is $59.99/mo standard rates apply after yr. * Limited time offer subject to change valid to qualified residential customers who have not subscribed to any services within the previous 30 days and who have no outstanding obligation to Charter. ![]()
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