Definition of light pen

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Photonics Dictionary

light pen: A handheld, light-sensitive device that is used with a display console to directly change, measure or erase the visual information presented. Interfaced with the computer that is generating the display, the pen is held up to the area of the display in which the change is to be made and senses the light emitted. This information is converted and sent back to the computer, which makes the appropriate change in the display according to its program.

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