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