Define periscope in 200 words
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a Periscope is an instrument for observation over ,around or through an object,obstacles or conditions that prevents direct line or sight observation from an observes 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 degree angle. this form of periscope
in its simplest form , it consists of an outer case with mirrors at each end set parallel to each other at a 45 degree angle. this form of periscope
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