Question

what is mean by periscope ​

Answer 1

Periscope is a Apparatus consisting of a tube attached to a set of mirrors are prisms by which an observer typically in a submerged submarine or behind a high obstacle can see the thing that are otherwise out of sight .

Answer 2

A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45° angle.

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