How Everything Works
How Everything Works How Everything Works
 

QUESTIONS AND ANSWERS
 
Question 428

What does a cleaning CD do?
The optical system of the CD player must be very clean. If the final lens has dust on it, the photodiode will not see the full range of light and dark patches that it expects. A cleaning CD presumably cleans this final lens, although I'm not sure how. In principle, the whole CD player should be pretty resistant to dust problems because the laser beams are large except when they focus on the CD itself.
         

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