What is the range of the visible spectrum?

The range of the visible spectrum is from approximately 400 to 760 nanometers (nm). This range encompasses the wavelengths of light that are detectable by the human eye, enabling us to perceive colors. The lower end of the range corresponds to violet light, while the upper end corresponds to red light.

Understanding the visible spectrum is important in various fields, including industrial hygiene, as it can relate to the assessment of light exposure in environments where workers may be affected by artificial lighting or sunlight. The ranges mentioned in the other options fall outside the wavelengths that humans can perceive. For instance, the range 100-400 nm includes ultraviolet light, which is not visible, while 760-1000 nm includes infrared light, also outside the visible spectrum. The range from 200-300 nm is primarily ultraviolet light, which can pose health risks but is not visible to the human eye. Thus, the correct answer accurately represents the range of visible light that is essential for human vision.