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2015-02-13T20:21:42+05:30
It is an instrument that is used by marine submarines used to located the ships when they are inside the water. It is build by Plane mirrors .... at an angle of 45 degree.
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2015-02-13T20:33:57+05:30
A periscope is an instrument used  for observing   through an object. it is used by submarines an underwater transport 
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