Periskopo: Diferi inter la revizi
Kontenajo efacita Kontenajo adjuntita
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[[Image:Simpleperiscopes.png|thumb|350px|right|'''Principle of the periscope.'''<br>
'''A''' - Periscope using two plane mirrors.<br>
''' B''' - Periscope using two right–angled prisms.<br>
'''1 - 2''' - Plane mirrors.<br>
'''3 - 4''' - Right–angled prisms.<br>
'''5 - 6''' - Observer eye.<br>
'''7 - 8''' - Periscope tube.<br>
'''H''' - Periscope optical height.]]
[[Image:Handheld periscope.png|thumb|150px|left|Military handheld periscope optical
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