Discussion
An optical scanner or simply a scanner is a ______________ electronic device used to read and capture printed text and images.
Answer: D
Correct answer: Light-Sensing
A scanner illuminates the document and measures the light reflected from it, using a row of light-sensitive elements - a CCD or contact image sensor - that converts brightness into a voltage and then into digital values.
It is an input device, since it turns something physical into data the computer can use, so the "output" option has the direction wrong. Sound plays no part, and "controlled" describes nothing about how the device works.
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