infrared

Light below the frequencyThe rate of change of a signal, specified in hertz, or cycles per second. of (or with longer wavelength than) visible light. The wavelength range is roughly from 800 nm to 1 mm. Near infrared is the range near the visible part of the spectrumA range of frequencies. A prism shows a range, or spectrum, of visible light frequencies (yes, light is a wave). This is the literal definition of spectrum. Other uses – like references to the autism spectrum use the word figuratively to indicate a continuous range. In our context, this refers to the range of radio frequencies available for communication. Access to those frequencies is usually regulated by governments since they're viewed as a public asset., from 800 nm to 2500 nm.