Question

What is a light pen?

Answer 1

Explanation:

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. .

Answer 2

A handheld photosensitive device resembling a pen, held to the display screen of a computer terminal for passing information to the computer.

                             OR

a handheld light-emitting device used for reading barcodes.