Write the use of light pen in computer
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A light pen is a computer input device in the form of light sensitive wands used in conjunction with a computer cathode ray tube display
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a light pen is a computer input device in the form of light sensitive wand used in conjunction with a computer's cathode ray tube(CRT) 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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