what is a periscope
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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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Helooooooooooooo
Ur answer is : periscope is a kind of instrument which is lower at the bottom and lifted on top. It is used to see on higher Altitude
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