Q. Codes consisting of light and dark marks of various thickness which may be optically read is known as :
Solution:
Bar code : A barcode is an optical, machine-readable, representation of data; the data usually describes something about the object that carries the barcode. Initially, barcodes were only scanned by special optical scanners called barcode readers. Later application software became available for devices that could read images, such as smartphones with cameras. Barcode was invented by Norman Joseph Woodland and Bernard Silver and patented in US in 1952.
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