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Media and communications

Lasers and recording A-Z

Analogue recording   A recording technique that makes a physical copy of sound waves. For example, the grooves in a record are a copy of the vibrations in an original sound. 

Barcode   A black and white pattern, scanned by a laser to reveal coded data. Black areas absorb the laser beam, but white areas reflect it back. The pattern is then recognized by the barcode scanner

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