What do you mean by 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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periscope
noun
a device like a long tube, containing mirrors which allow you to see over the top of something, used especially in a submarine to see above the surface of the sea.
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