Optical fibres

Optical fibres

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Caption: Optical fibres, held by a hand, transmitting light. Optical fibres are made from flexible glass that has a high refractive index. Each fibre consists of a glass core with an outer protective glass 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 information loss. Photographed in France.

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