Solar Concentrators are mirrors or lenses tha take a large area of sunlight and direct it towards a specific spot by bending/reflecting the rays of light and focusing them. They are used in concentrated Solar Power (CSP). Examples of Solar Concentrators include Parabolic troughs/mirrors, fresnel lenses etc. Concentrators like Fresnel lenses, reflective dishes, and light guide optics are also used to increase the efficiency of Multi Junction Solar-Cells.