Falling compact discs leaving trails of colour

Falling compact discs leaving trails of colour

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Credit: KEN M. JOHNS/SCIENCE PHOTO LIBRARY

Caption: Compact discs. Falling compact discs leaving trails of colour. Each disc stores data as a series of fine depressions, representing a digitised signal capable of being read by a laser. To reflect the laser light, the data layer is coated with a fine film of metal which follows the depressions exactly. This layer is covered by layer of plastic which prevents dust and scratches from affecting the reading of the information.

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Keywords: audio sound, cd, colour trails, communication, communications, compact, compact disc, disc, falling, technology, trails

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