COMPUTER HARDWARE
INPUT DEVICES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a barcode is scanned, it is illuminated with a red light called ____.
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laser
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lighter
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scanner
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illuminator
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Explanation:
Detailed explanation-1: -Scanners read barcodes best when the background reflects light and the bars don’t reflect any. Scanners have a hard time picking up yellow and red colors because they can’t “see” those colors, but black and blue based colors are much easier for a scanner to pick up.
Detailed explanation-2: -More specifically, the sensor in the barcode scanner detects the reflected light from the illumination system (the red light) and generates an analog signal that is sent to the decoder. The decoder interprets that signal, validates the barcode using the check digit, and converts it into text.
There is 1 question to complete.