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Old 05 November 2014, 10:19 AM
kaylagarcia kaylagarcia is offline
Join Date: 04 November 2014
Location: Nevada
Posts: 1

CDs and DVDs are designed to have the laser light enter and leave the clear plastic disc surface at a 90 degree angle, and then make its way back to a sensor which reads the effects of tiny pits inside the CD on the laser light. Scratches change the plastic surface's angle to something else, and that changes the laser light's path on both the way in and out of the disc.
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