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Answer for the clue "Sensor in a CD player ", 10 letters:
photodiode

Word definitions for photodiode in dictionaries

Wikipedia Word definitions in Wikipedia
A photodiode is a semiconductor device that converts light into current . The current is generated when photons are absorbed in the photodiode. A small amount of current is also produced when no light is present. Photodiodes may contain optical filters ...

Wiktionary Word definitions in Wiktionary
n. a semiconductor two-terminal component whose electrical characteristics are light-sensitive

Usage examples of photodiode.

I rewrote the program, put the lights on a rheostat with a photodiode to measure the lumens and connected everything to the computer.