Question

How many plane mirrors are used in making periscope

Answer 1

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.[1][2]

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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Answer 2

Two plane mirrors are used which are parallel to each other.