Burning glass extremely high temperatures without the need for fuel or large supplies of electricity. They sometimes employ a large parabolic array of mirrors (some facilities are several stories high) to focus light to a high intensity. The Olympic torch that is carried around the host country of the Olympic Games is lit by a burning glass, at the site of ancient Olympia in Greece. Burning glass A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning
2010 Summer Youth Olympics torch relay the end of each day, the flame would be returned to the safety lantern. The safety lantern was also used to keep backup flames lit, allowing the main torch to be re-lit should it go out. At least three safety lanterns were kept lit throughout the duration of the relay. The cauldron, not to be confused with the Olympic cauldron lit during the opening ceremony, was lit at each community celebration site. These were found at the last location of activities during the relay at the 5 cities visited, as well as at the end of each day during the