Question

what is periscope?.................. ............​

Answer 1

Answer:

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.

Explanation:

Answer 2

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what is periscope?

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A periscope is a long, tubular device through which a person can see objects that are out of the direct line of sight.