- a rodlike device which, when applied to the screen of a cathode-ray tube, can detect
the time of passage of the illuminated spot across that point thus enabling a computer
to determine the position on the screen being pointed at
- a penlike device, used to read bar codes, that emits light and determines the intensity
of that light as reflected from a small area of an adjacent surface
Example Sentences Including 'light pen'
Although the original programming for a light pen is complicated its use can enable designs to be created and changed very quickly.
Computers Basic Facts
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