A pen shaped device which can sense light, and is used to point at spots on a video screen.

A. Mouse

B. Light pen

C. Joystick

D. Plotter

E. None of the above

Answer: Option B

Solution(By Examveda Team)

Light Pen : A light pen is a light-sensitive computer input device, basically a stylus, that is used to select text, draw pictures and interact with user interface elements on a computer screen or monitor. The light pen works well with CRT monitors because of the way such monitors scan the screen, which is one pixel at a time, giving the computer a way to keep track of the expected scanning time by the electron beam and infer the pen's position based on the latest timestamp of the scanning.