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hello here is your answer by Sujeet yaduvanshi....
Definition of periscope. : a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view.
Definition of periscope. : a tubular optical instrument containing lenses and mirrors by which an observer obtains an otherwise obstructed field of view.
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an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.
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