UPC price scanners at supermarket checkouts use laser holography to read the bar codes because the packages are three dimensional.

Question

Quizplus · Accepted Answer

UPC price scanners at supermarket checkouts do use laser technology to read the bar codes, but not holography. The laser scans the flat surface of the bar code, which encodes information in a two-dimensional pattern. Therefore, the statement that holography is used to read bar codes because packages are 3-dimensional is false.

UPC Price Scanners at Supermarket Checkouts Use Laser Holography to Read