1.   An optical fibre uses total internal reflection to carry a light beam over long distance and around corners.

2.   Nothing unusual - clocks behaving as before, keeping good time and continuing to emit their light beams.

3.   You were sitting in your seat, pressed back by the acceleration, and you saw the light beams curve.

4.   The light beam, which can be polarized, or left unpolarized, is collimated before passing through the cell.

5.   The new hand-held equipment, on test in Hereford and Worcestershire, uses a laser light beam to pinpoint cars almost half a mile away.

6.   And in the digital version of whispering, some of the devices can transmit short messages to another device across the room via infrared light beams.

7.   Another is to create a grouping of vertical light beams that would symbolize the vanished towers.

8.   As travelers move through the walkway, they activate invisible light beams that produce sounds ranging from frogs to flute music.

9.   But it is proving vital it is for studying the effects of chaos on light beams.

10.   Glasses, too, create problems for infrared systems, as they interfere with the light beam.