You are at question (MCQ) number 5 and Test Number 45 of Computer Science and IT: All topics. To deal with Computer Science and IT questions, you must take lesson on the subject. In case of science and Art subjects revise your text books and in case of general aptitude topics take lessons from the topic page.
The question: What is a light pen?
.... with options: A Mechanical Input device
, Optical input device
, Electronic input device
, Optical output device can be solved with the concepts and understanding of Computer Science and IT.
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