Which of the following is an input device which can sense light, and is used to point at spots on a video
screen?
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A.
Light pen
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B.
Plotter
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C.
Mouse
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D.
Joystick
Correct Answer:
A. Light pen
Explanation:
A light pen is the correct answer because it is an input device specifically designed to detect light emitted from a video screen. Shaped like a pen and equipped with a light-sensitive tip, it works by registering the exact moment the screen's electron beam or pixels illuminate the area it is touching. This timing allows the computer to identify the pen's precise location, enabling the user to point at, select, or draw directly on the display. In contrast, a plotter is an output device for printing, while mice and joysticks track physical movement rather than sensing light from the screen.
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