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
Olympic flame the London 2012 Games. In transit, the flame sometimes travels by air. A version of the miner's safety lamp is used, kept alight in the air. These lamps are also used during the relay, as a back-up in case the primary torch goes out. This has happened before several Games, but the torch is simply re-lit and carries on. The cauldron and the pedestal are always the subject of unique and often dramatic design. These also tie in with "how" the cauldron is lit during the Opening Ceremony. The Olympic flame has been used as a symbol and main motif