Through the Looking Door

One common type of lens with which almost everyone is familiar is the simple door viewer ("peephole"), which allows a homeowner or hotel room occupant to view a wide field through a small hole in the door while preventing anyone from seeing in through the viewer.

Become a member of OSA or log in to view the full text of this article.

OSA Members get the full text of Optics & Photonics News, plus a variety of other member benefits.


Add a Comment

comments powered by Disqus