21. The flame is ignited in a concave mirror by the sun's rays in the mountains around the Olympics'ancient birthplace. 22. It comprises a circular concave mirror , with a small hole in the middle, and is attached to a head band. 23. The flame is usually ignited in a concave mirror by the sun's rays in the mountains around the Olympics'ancient birthplace. 24. But cloudy skies and sporadic showers prevented the ritual lighting of the flame using the sun's rays hitting a concave mirror . 25. The flame was lit by the concentrated rays of the sun in a concave mirror , amid the ancient ruins of Olympia. 26. Curious about how light and concave mirrors could be used in her work at NASA, she began her research in 1977. 27. Thalia Prokopiou, one of two dozen women that took part in the ceremony, placed a silver torch inside a burnished-steel concave mirror . 28. A total of seven concave mirrors were excavated from Complex A at La Venta; they were fashioned from hematite, ilmenite and magnetite. 29. The flame was unable to be lighted in a concave mirror by the sun's rays in the mountains around the Olympics'ancient birthplace. 30. We also have concave mirrors in the halls to prevent accidents between ( people on foot ) and people on scooters . ..
