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periscope


periscope
An optical instrument that permits an observer to view his surroundings along a displaced axis, and hence from a concealed, protected, or submerged position. The simplest periscope, used in tanks, has two parallel reflecting surfaces (prisms and mirrors). An auxiliary telescopic gunsight may be added. Submarine telescopes have a series of lenses within the tube to widen the field of view, cross-wires, and a range-finder, and can rotate and retract.


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   • OPTICS AND OPTICAL PHENOMENA
   • TECHNOLOGY


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