What is a periscope?
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What is a periscope?
An optical instrument which used by people to look at things from a hidden position.
- Mirror should parallel to each other at a 45° angle.
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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. There are 4 mirrors in a periscope.
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