KEN M. JOHNS / SCIENCE PHOTO LIBRARY KEN M. JOHNS / SCIENCE PHOTO LIBRARY
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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