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A light pen is a computer input device that allows a user to draw directly on the screen by detecting the light emitted from the display. It typically functions as a pointing device, enabling users to interact with graphics displayed on the screen. Light pens were commonly used in early computer graphics systems and are similar in function to a stylus used on touchscreen devices, although light pens require a photosensitive mechanism to function properly with CRT displays.
B. Optical input device
B. Optical input device