Discussion :: Computer Fundamental Miscellaneous
- A pen shaped device which can sense light, and is used to point at spots on a video screen.
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Answer : Option B
Explanation :
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.
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