How does a scanner work?

Scanners are used to create a soft copy of available photos and documents.

When we open the scanner we can see a glass plate. We have to place the
document that we need to scan over the glass plate.

During the scanning process, a scanning unit moves across the document to be scanned at a speed designated by the logic board instruction. The scanning unit emits light. The light strikes the document, reflects, and is then reflected by a series of mirrors to the scanner lens. The light passes through the scanner lens and
falls over the light sensors. The amount of light reflected from the document
is measure and converted into corresponding electrical signal and transmitted
to the computer. The electrical signal gives the exact image of the document
being scanned and it can be stored in the memory.

 
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