A periscope is an instrument used for observing objects from a hidden position. T or F
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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!!....xD!!
hence ur ans is true!!
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