discuss the functioning of 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 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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A light pen is a peripheral input device, used for inputting analog information in a digital format.
The "analog" information may be a plan or drawing which needs to be digitized so that it can be manipulated in a computer program.
An architect for example may use a pen to copy a set of drawing into he computer so that they can be manipulated in a CAD program.
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