Final answer:
The wavelengths of light visible to the human eye span from approximately 400 to 700 nanometers, covering the color spectrum from violet to red within the electromagnetic spectrum.
Step-by-step explanation:
The wavelengths of light that are visible to the human eye range from about 400 nanometers (nm) to 700 nanometers (nm). This range encompasses the spectrum of colors visible to the average human, from violet (shortest wavelength) to red (longest wavelength). When discussing the electromagnetic spectrum, visible light falls between infrared and ultraviolet light, illustrating its relatively narrow range within the broader spectrum.
Variations in perceived exact range, such as mentioning 750 nm or 800 nm, typically reflect boundary transitions with infrared light or the ultraviolet spectrum that are not sharply defined. For example, ultraviolet light begins just beyond the visibility range, where human eyesight normally does not respond. Despite these minor variations in cited boundaries, the recognized standard for visible light's range remains between 400 nm and 700 nm.