Computer Science for IGCSE & O level - Hardware (Section 14 - No. 32)
What are the primary components of a 2D scanner?
A laser and a photocell.
A light source and a sensor.
A CCD chip and a mirror.
A lens and a prism.
Vysvětlení
Scanners generally use a light source to illuminate the document and a sensor to capture the reflected light.