Final answer:
The spectrum of light visible to humans is known as visible light, which is characterized by wavelengths ranging from 400 to 700 nm and falls between ultraviolet and infrared light on the electromagnetic spectrum.
Step-by-step explanation:
Visible Spectrum of Light
The part of the spectrum of light that is visible to humans is called visible light. It occupies a relatively small part of the electromagnetic spectrum, within the range from about 400 to 700 nanometers (nm). This range lies between ultraviolet light and infrared light, which are not visible to the human eye. While other forms of electromagnetic radiation, such as gamma rays, microwaves, radio waves, X-rays, and ultraviolet radiation, are not visible, visible light is the portion that our eyes have evolved to detect. The energy of a photon in the visible spectrum is characterized by its wavelength, which corresponds to the different colors we can see.