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Tabitha Smith is a superhero appearing in American comic books published by Marvel Comics, commonly in association with The X-Men and related titles. Created by Jim Shooter and Al Milgrom, the character first appeared in Secret Wars II #5 (Nov. 1985). She then appeared as a member of X-Force and later as a member of Nextwave .
Doublet (lens) An old Carl Zeiss Tessar camera lens with four elements, comprising two doublets. The front doublet is air-gapped and divergent; the rear doublet is glued and convergent. This arrangement was better at correcting spherical and chromatic aberrations and astigmatism than previous lens designs. In optics, a doublet is a type of lens ...
Toric lens surface as "cap" (top-right) from a torus (here with R = 1.2 r ). A toric lens is a lens with different optical power and focal length in two orientations perpendicular to each other. One of the lens surfaces is shaped like a "cap" from a torus (see figure at right), and the other one is usually spherical.
Written by Lisa O’Mary. 2 min read. April 30, 2024 – People with multiple sclerosis who drank a medicine containing gold nanocrystals daily for nearly 3 years got better vision. Vision ...
Light being refracted by a spherical glass container full of water. Roger Bacon, 13th century. Lens for LSST, a planned sky surveying telescope. The word lens comes from lēns, the Latin name of the lentil (a seed of a lentil plant), because a double-convex lens is lentil-shaped. The lentil also gives its name to a geometric figure.
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Twin-lens reflex camera. The front of a Kinaflex twin-lens reflex camera. The focus rings of the two lenses are coupled with gears around their circumference in this simple design. A twin-lens reflex camera ( TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective or "taking ...
The object in designing a field flattening lens is to create a lens that shifts the focal points of the Petzval surface to lie in the same plane. Consider inserting a pane of glass in a focusing beam. Due to refraction, the focal point of the beam is shifted by dependent on the thickness of the glass. Thus we have a thickness as a function of ...