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Because it emits a beam of light - which is detected by a special membrane on the computer screen.

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12y ago

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What does a light pen contain?

A light pen typically contains a light sensor that detects light emitted from a computer screen. When the pen is pressed against the screen, the sensor registers the light and communicates with the computer to determine the pen's position on the screen.


Is a light pen mechanical or optical device?

A light pen is an optical device that detects light emitted by a computer screen to determine the position of the pen on the screen. It is used as an input device to interact with computers by pointing, clicking, and drawing on the screen.


How a light pen works?

A light pen works by detecting light emitted by a computer monitor or screen when the pen's tip touches the surface. The pen has a light-sensitive photodiode at the tip, which detects the light and sends a signal back to the computer to identify the pen's position on the screen. This allows users to interact with software by pointing and selecting on the screen.


How does lightpen work?

A light pen operates by detecting the light emitted from a computer screen when activated by a user pressing the pen against the screen. The screen emits electron beams that are picked up by the light pen, allowing the computer to determine the location on the screen that the pen is pointing at.


What is the disadvantage of the light pen?

One disadvantage of a light pen is that it requires a display with a special coating to detect the light emitted by the pen accurately. Additionally, it can be less precise than other input devices like a mouse or stylus.