The Fresnel lens (in which concentric steps maximise light focus and minimise lens weight), popular in the 1900s in vehicle lights, was first devised c.1820 for what application?
Fresnel lens Other Window", in which a scientist places a Fresnel lens on a window of his home, and his children and his mother are able to see visions of their ancestors in previous centuries in it. In the horror manga "Uzumaki" by Junji Ito, the concentric patterns of the Fresnel lens of a lighthouse are melted by heat and form a spiral. A subplot in Jimmy Buffett's novel "A Salty Piece of Land" follows the characters' efforts to find a Fresnel lens to refurbish a Bahamian lighthouse. A Fresnel lens is featured in the 2016 film "To Keep the Light" wherein
Fresnel lens of a Fresnel lens is a rear view enhancer, as the wide view angle of a lens attached to the rear window permits examining the scene behind a vehicle, particularly a tall or bluff-tailed one, more effectively than a rear-view mirror alone. Multi-focal Fresnel lenses are also used as a part of retina identification cameras, where they provide multiple in- and out-of-focus images of a fixation target inside the camera. For virtually all users, at least one of the images will be in focus, thus allowing correct eye alignment. Fresnel lenses have also been used in the field of popular