Optical fibres

Optical fibres

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Optical fibres emitting light. These fibres are used for transmitting sound and images in the form of light. They are usually made from flexible glass that has a high refractive index. Each fibre consists of a core with an outer protective layer (cladding) that has a lower refractive index than the core. Light travelling through the fibre is contained within the core because of total internal reflection at the core/cladding boundary. This allows data to be transmitted over long distances with little or no absorption of light.

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Keywords: bundle, bundles, communication, communications, data transmission, digital, emitting, fibre optics, illuminated, illumination, light, lights, lit, many, multiple, optic, optical fibres, sparkling, speed of light, technology, telecommunication, telecommunications, transmitting, twinkling

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