PERISCOPE
Periscope
a Mirrorsb Prisms
c Observer's eye]]The two periscopes differ in the way they erect the image. The left one uses an erecting prism whereas the right uses an erecting lens and a second image plane.
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periscope
Noun
- A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.
- : A general or comprehensive view.
Verb
- To rise and peer around, in the manner of a periscope.
The above text is a snippet from Wiktionary: periscope
and as such is available under the Creative Commons Attribution/Share-Alike License.