electromagnetic radiation in or near visible spectrum
Schematic animation of a continuous beam of light being dispersed by a prism. The white beam represents many wavelengths of visible light, of which 7 are shown, as they travel through a vacuum with equal speeds c. The prism causes the light to slow down, which bends its path by the process of refraction.
fountain in Nagorno-Karabakh
Lights at an airport
Earth at night seen from space (Aurora Australis)Main category: Aurora Australis