A band of colors as seen in a rainbow, produced by separation of components of light by their different degrees of refraction…

The entire range of wavelengths of electromagnetic radiation

The second half of the stimulus-response relationship in psychology

Fluorescence occurs when an orbital electron of a molecule, atom or nanostructure relaxes to its ground state by emitting a photon of light after being excited to a higher quantum state by some type of energy.

The most striking examples of fluorescence occur when the absorbed radiation is in the ultraviolet region of the spectrum, and thus invisible to the human eye and the emitted light is in the visible region. Wikipedia

The scientific study of sight and the behavior of light, or the properties of transmission and deflection of other forms of radiation.

Light or heat as emitted or reflected by something: Radiance and spectral radiance are measures of the quantity of radiation that passes through or is emitted from a surface and falls within a given solid angle in a specified direction.

A discrete quantity of energy proportional in magnitude to the frequency of the radiation it represents.



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