Archimedes invented an ingenious device to destroy enemy ships. It was called Archimedes’ Heat Ray. This device entailed a series of mirrors that was used to converge sunlight on the attacking ships. The concentrated form of light resulted in increasing the temperature and, thus, burned down the ships. In the recent times, Heliostat or solar furnace has been created and this device works in similar ways as that of Archimedes’ Heat Ray.