Information about periscope
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A periscope is an optical instrument that allows objects that are not in direct line of sight to be viewed. Periscopes have proven to be of great help to submariners by allowing these professions to have a view above the surface of water and aid in navigation under water. A simple periscope only requires mirrors, whereas a more complicated periscope utilizes prisms rather than mirrors. The periscopes used in submarine applications are complex, typically requiring the use of tubes that are at least 10 meters in length to achieve a greater range of scope.
==>>A periscope is defined as an instrument used for observing over, around or through an obstacle or object which is prevented by direct line of sight.
==>> It consists of an outer case with mirrors at each end at 45° angle. These mirrors are placed parallel to the surface.
==>>The periscope is used in the submarines to see what is going on the water surface.
==>>It was used for observation purposes in the trenches during World War I, It is used in some gun turrets and it is used in armed vehicles.