what is a light pen
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A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's cathode-ray tube display. It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional accuracy.
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light pen is an input device used in computer by using specific intensity of light waves.
or
a handheld photosensitive device resembling a pen, held to the display screen of a computer terminal for passing information to the computer.
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