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A Light Pen is a pointing device shaped like a pen and is connected to a VDU.
The tip of the light pen contains a light-sensitive element (photocell) which, when placed against the screen, detects the light from the screen enabling the computer to identify the location of the pen on the screen.
Light pens have the advantage of 'drawing' directly onto the screen (CAD)
Commonly used because their functioning is relatively easy multiple copies can be produced at the same time with the help of carbon paper. Dot Matrix Printers, Line printers, daisy wheel printers They uses thermal, chemical, electrostatic and inkjet technologies for printing. Laser printers, DeskJet printers