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'''7 - 8''' - Periscope tube.<br>
'''H''' - Periscope optical height.]]
[[Image:Periscope 1.png|thumb|350px|right|'''Principle of the lens periscope.'''{{-}}
'''A''' - Periscope using a single lens ('''L2''') to correct image.{{-}}'''B''' - Periscope which uses two lenses ('''L2-L3''') to correct image.{{-}}'''1-3''' - Periscope window.{{-}}'''2-4''' - Field stop or reticle.{{-}}'''P''' - Right–angled prisms (or plane mirrors).{{-}}'''L1''' - Objective lens.{{-}}'''L2''' - for '''A''' - '''L2 - L3''' - for '''B''' - Image erecting lens.{{-}}'''L3''' - '''L4''' -for '''A''' - '''L4-L5'''- for '''B''' - Eyepiece.{{-}}'''L0''' - Field lens.{{-}}'''y''' - Distant object.{{-}}'''H''' - Periscope optical height.]]
[[File:Zeiss U Boath Periscope 1943.png|thumb|right|Zeiss submarine periscope optical design.]]
[[File:Attack periscope.png|thumb|right|Submarine monocular attack periscope.]]
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