What kind of wavelengths does monochromatic light have?

Monochromatic light is defined as light that consists of a single wavelength or a very narrow range of wavelengths. This means that all the light in a monochromatic source appears to be of the same color, as color perception is directly linked to wavelength. When light is described as monochromatic, it is typically associated with laser light, which is highly coherent and exhibits minimal variation in wavelength.

The definition of monochromatic light effectively rules out options that suggest the presence of multiple distinct wavelengths or a broad spectrum, as those conditions would indicate the involvement of multiple colors or wavelengths, which contrasts directly with the concept of being monochromatic. Additionally, while ultraviolet light can indeed be monochromatic, it does not encompass the complete definition, which applies to any single wavelength, regardless of whether it is in the ultraviolet range or elsewhere in the electromagnetic spectrum. Therefore, stating that all monochromatic light is of the same color or wavelength is the most accurate description.