Question

What is periscope? For what purpose it is used.
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Answer 1

Answer:

he periscope is an instrument for observation over, around or through the object, obstacle or condition that prevents direct line-of-sight observation from the observer’s current position, The periscope is used to monitor the dangerous chemical reactions in the laboratory and they are used in observing the nuclear reactors.

Explanation:

Answer 2

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:

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