Optical components are items that are used to bend, split, diffuse, reflect or otherwise alter or refocus light wavelengths. This may include changing the spectrum of the light, transforming a light pattern into an electric one (image), or simply altering the direction or path. These items generally function without an outside power source, although they may be part of a larger system that does require a power source. Typical components within this family include lenses, filters, beamsplitters, mirrors, diffusers, plates, prisms, and windows.