what is a periscope or inverted
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Periscope is a tube in each end of which there are plane mirrors set parallel to each other at 45 degree angle. The image formed by plane mirror is virtual and laterally inverted.
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The 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.
In 1854, Hippolyte Marié-Davy invented the first naval periscope.
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