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Q. What was invented by Zacharias Jansen?
Answer: Microscope
Notes: Two Dutch spectacle makers, Hans and Zacharias Jansen are credited with inventing the first optical microscope in around 1595. Janssen is sometimes also credited for inventing the first truly compound (2 or more lens) 9x magnification optical microscope.

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This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app.

Question Number: 108 in Discoveries & Inventions in above course in App.