In the following question, out of four words given below, three are alike in some manner and fourth word is different. Find the different one.
Detailed Explanation:
Telescope, Microscope, and Periscope are optical instruments that use lenses and mirrors to view objects (distant, tiny, or around obstacles).
Stethoscope is an acoustic medical device used to listen to internal body sounds (heartbeat, lung sounds), not for viewing.
Question 2 of 11 Light and Optics
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