Compact disc being read by laser

Compact disc being read by laser

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Credit: SCOTT CAMAZINE/SCIENCE PHOTO LIBRARY

Caption: Compact disc and laser. A compact disc (CD) being read by a laser. The disc stores audio data such as music, as a series of fine depressions, representing a digitised musical signal capable of being read by a laser. To reflect the laser light, the music layer is coated with a fine film of metal which follows the depressions exactly. This layer is covered by another layer of transparent plastic which prevents dust and scratches from affecting the sound quality.

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Keywords: audio sound, cd, communication, communications, compact disc, laser, technology

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