What is the use of a light pen?

Q. What is the use of a light pen?

Answer :-

A light pen is a pointing device that can be used to select anything on the computer screen by simply pointing at it or for drawing figures directly on the screen. It consists of a Photocell mounted on a pen-shaped tube and is capable of sensing a position on the screen when its tip touches the screen. Clicking is performed by pressing the pen on the screen. A light pen is mostly used by engineers, architects or designers.