2 Square Meters of Sunlight, When Focused, Can Melt a Rock
(Video Link) Bang Goes the Theory is a popular science show on BBC One. In this clip, host Jem Stansfield visited the Solar Furnace Research Facility in France and witnessed how much power can be generated...
https://www.neatorama.com/2010/11/25/2-square-meters-of-sunlight-when-focused-can-melt-a-rock/