Optical fibres

Optical fibres

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Credit: MATTEIS/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY

Caption: Optical fibres emitting light. These fibres are for a high-speed communications networks. They 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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