Polarization is a property of light, or other electromagnetic radiation, that is primarily understood through studying the waves of the radiation. It was discovered by Etienne Louis Malus, a French physicist in the early 1800s. Visible light is the range of electromagnetic radiation that humans can see, and its wavelengths have a range from about 380 to 740 nanometers. Electromagnetic radiation is radiation that is produced by electric and magnetic fields that travel together at the speed of light through space.