query: What is the wavelength of visible light?
passage: Visible spectrum
The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 740 nanometers.[1] In terms of frequency, this corresponds to a band in the vicinity of 430–770 THz.
passage: Glossary of video terms
Electromagnetic radiation that has a wavelength in the range from about 400 to 750 nm and may be perceived by the normal unaided human eye.