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How do CD players use light?

Updated: 10/26/2022
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15y ago

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CD players use light to read CD's. The data side of a CD is basically a giant mirror for a particular frequency of laser, except it has all these pits in it. Basically, the drive shines a laser beam at the disk, and if it hits a flat part, it bounces back, and if it hits a pit, it bounces somewhere else. Depending on where the light beam comes back, the CD drive figures out what data was encoded on the CD.

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Q: How do CD players use light?
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