Light-emitting diodes are small glass lamps that use much less electricity than traditional bulbs and last much longer.

VOA: special.2009.12.21

He learned to get light to go far enough down a glass fiber to pass on signals.

VOA: special.2009.12.08

I turned on a strong light under the glass and looked through the diamond lens.

VOA: special.2011.06.25

Mister Kao discovered how to transmit,or send,light signals over long distances through optical glass fibers.

VOA: special.2009.12.08