Computer Science for IGCSE & O level - Hardware (Section 4 - No. 22) | ExamPlay

Computer Science for IGCSE & O level - Hardware (Section 4 - No. 22)

What type of light does a barcode scanner use?

Ultraviolet.

Infrared.

Red laser.

Green laser.

Spiegazione

A red laser or LED is used in barcode scanners.

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