Composite light is light that consists of lights of different colors.

The palette of colors that make up composite light is called a spectrum.

White light is composite light that we perceive as white. The spectrum of white light is not always the same. For example, if we look at a white LED lamp or a white daylight lamp, their spectra are very different. However, all light sources that appear white to us must have red, blue, and green colors.

White light is composite light and its components can be separated from each other. For this purpose, optical devices are used, which direct light rays of different colors falling on it in different directions.

Erasing or weakening a region or regions of the spectrum from composite light is called light filtering . A device that filters light is a light filter .