What method is used to read a bar code?
A)The magnetic bar codes are converted by a bar code reader into a form that a computer can process.
B)A laser translates the bars on the bar code into digital signals that are stored in RAM.
C)A laser scanner produces light beams that pass through a scanner filter which then translates the light patterns into digital patterns that can be interpreted by the CPU.
D)A bar code reader uses laser beams to read bar codes.

Question

Quizplus · Accepted Answer

A bar code reader uses laser beams to read bar codes. This emits a laser beam that is absorbed by the black bars in the code, and reflected by the white spaces. The reflected light is then detected by the scanner and transformed into an electrical signal, which is then decoded by the computer.

What Method Is Used to Read a Bar Code