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What is Fiber Optics?

Fiber optic technology allows humans to control the path of a beam of light by confining it within ductile, transparent materials, like cords of plastic and glass. These transparent materials function as pipelines for light, and with their help, light, which usually moves in straight lines, can be sent along curved trajectories or around corners. Optical fibers of very pure glass have a surprisingly massive range, having been observed to carry light across distances greater than 100 miles (160 km) with only slight dimming. Some individual fibers measure less than 0.00015 inches (0.004 mm) wide, which makes them thinner than human hair. The light transmitted by optical fibers can be used for simple illumination, or to transmit signals and data. Though there was some practical application of fiber optic technology as early as the 1950s, major commercial implementation began in the 1980s.

Виберіть правильний варіант.

1. In fiber optics technology, such materials as ___ are used to transmit light.

a) wood b) plastic c) metal

2. Optical fibers can carry light over the distances of ___.

a) 1,000 km b) 100 km c) 10,000 km

3. The thickness of a single fiber is ___.

a) that of a match b) less than that of a human hair c) 3 inches

4. The commercial application of fiber optic began in ___.

a) 1950s b) 1980s c) the 21st century

18.4. Граматика. Порівняльні конструкції as ... as, not so ... as, the ... the та інші


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