Computer Science for IGCSE & O level - Hardware (Section 1 - No. 22)
In the barcode system, what is the function of the dark and light parallel lines of varying thicknesses?
They represent digits and are scanned by a laser or LED.
They store the item's price.
They control the speed of the scanner.
They protect the barcode from damage.
Giải thích
The text states that varying thicknesses of dark and light parallel lines represent digits.