Definition - What does Visible Light mean?
Visible light is the portion of the electromagnetic spectrum that can be seen with the naked eye. The electromagnetic spectrum consists of different forms of electromagnetic radiation, but only those falling within wavelengths of 390-700 nm can be detected by the human eye.
Safeopedia explains Visible Light
Radio waves, UV radiation, infrared and X-rays are all forms of electromagnetic radiation, but visible light included only the wavelengths that can be seen by the eye. Within the visible light spectrum, there are a range of perceptible colours – these represent shorter or longer wavelengths within the spectrum of visible light that are reflected from the surface of objects and are perceived as colors. Light is red, green or violet, while the other colors we see consist of mixtures of these three light colors.