Peephole
From Infogalactic: the planetary knowledge core
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File:Peephole.jpg
A visitor approaches a door, as viewed through the peephole
A peephole is a small opening through which one may look.
In a door, usually for an apartment, a peephole allows people inside the security of seeing outside without opening the door. Glass peepholes are often fitted with a fisheye lens to allow a wider field of view from the inside and little to no visibility from the outside.[1]
References
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Look up peephole in Wiktionary, the free dictionary. |
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- ↑ Peephole Is One Way Viewer Popular Science, July 1950, pg 153, right-side
