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Related to periscopic: periscopic sextant, periscopic lens
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Light enters the top lens of a periscope, reflects off a mirror set at a 45 degree angle, travels down the periscope tube, and reflects off a second mirror, also set at a 45 degree angle. Light that reflects off the second mirror exits through the bottom lens and into the eye of the user.


Any of various tubular optical instruments that contain reflecting elements, such as mirrors and prisms, to permit observation from a position displaced from a direct line of sight.

per′i·scop′ic (-skŏp′ĭk), per′i·scop′i·cal (-ĭ-kəl) adj.


(of a lens) having a wide field of view
ˌperiˈscopically adv


(ˌpɛr əˈskɒp ɪk)

1. (of certain lenses in special microscopes, cameras, etc.) giving distinct vision obliquely, or on all sides.
2. pertaining to periscopes or their use.
References in periodicals archive ?
Recurring problems led to the army ending the purchase of W&S sights and permission was granted to brigade commanders to purchase other telescopic sights and a number of Winchester A5 scopes and Periscopic Prism Co.
I operated a periscopic TV camera so the commander, Anatoly Artsebarsky, could establish where we were heading.
The house takes into consideration two types of views: telescoping and periscopic.
The gunner's digital periscopic sight is of the head mirror type and is mechanically linked to the stabilized main gun.
Not only can the narrator's periscopic gaze penetrate the interior of the husband's new lodgings, but it can also excess the lineaments of his personal inner space.
This compact massif of rock outcrops (mountains) extends from Kona area through the border between Jalingo and Lau LGAs down to Yorro and Ardo Kola LGAs in a circular form to Gongon area, thus given a periscopic semi-circle shape that is almost like a shield to Jalingo town.