A light pen is an Optical input device. A light pen functions by detecting light from a computer screen, allowing the user to interact with it by pointing or drawing. The "optical" part refers to its use of light detection as the primary input method.
What is a Light Pen?
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Question context
This question is part of 💻 Computing within the broader 💾 Computer Science subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.