The light pen is used to draw objects on a CRT computer screen. They are also used to display objects over computer devices.
Uses of light pen
The principle is the infrared light source that is inside. It takes all of the colors in the spectrum and uses them to make the light work.
a pen light :)
function of light pen
Light Pen is an input Device.
Light Pen is an input Device.
A pen uses ink while a pencil uses lead.
teachers
technical PEN.
Because it emits a beam of light - which is detected by a special membrane on the computer screen.
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT TV set or monitor. It allows the user to point to displayed objects, or draw on the screen, in a similar way to a touch screen but with greater positional accuracy. A light pen can work with any CRT-based display, but not with LCD screens (though Toshiba and Hitachi displayed a similar idea at the "Display 2006" show in Japan[1]), projectors and other display devices. An input device that utilizes a light-sensitive detector to select objects on a display screen. A light pen is similar to a mouse, except that with a light pen you can move the pointer and select objects on the display screen by directly pointing to the objects with the pen.
Light pen is a mechanical or optical device? i don't know answer for this
Mouse or light pen