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How does a bar code reader read the data?

A bar code reader is a device used for reading (decoding) bar-coded data. It may be a
 hand-held scanner, or may be embedded in a stationary scanner. It scans a bar-code image
 and converts into and converts in into a alphanumeric value, which is then fed to the
 computer to which the bar-code reader is connected. Just as though the alphanumerical value
 had been typed on a keyboard.
 A bar code reader uses a laser-beam scanning technology. The laser beam is stroked across
 the pattern of bars of a bar-code. Different bar codes having different patterns of bars reflects
 the beam in different ways, which is sensed by a light-sensitive detector. Reflected them
 transmitted to recognition logic circuits which convert in into an alphanumeric value.