Definition of Lenses. Meaning of Lenses. Synonyms of Lenses

Here you will find one or more explanations in English for the word Lenses. Also in the bottom left of the page several parts of wikipedia pages related to the word Lenses and, of course, Lenses synonyms and on the right images related to the word Lenses.

Definition of Lenses

Lenses
Lens Lens (l[e^]nz), n.; pl. Lenses (-[e^]z). [L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. Lentil.] (Opt.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure. Lenses Note: Of spherical lenses, there are six varieties, as shown in section in the figures herewith given: viz., a plano-concave; b double-concave; c plano-convex; d double-convex; e converging concavo-convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus. Crossed lens (Opt.), a double-convex lens with one radius equal to six times the other. Crystalline lens. (Anat.) See Eye. Fresnel lens (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; -- so called from the inventor. Multiplying lens or glass (Opt.), a lens one side of which is plane and the other convex, but made up of a number of plane faces inclined to one another, each of which presents a separate image of the object viewed through it, so that the object is, as it were, multiplied. Polyzonal lens. See Polyzonal.

Meaning of Lenses from wikipedia

- material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such...
- Play media Contact lens, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used...
- signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) might be used to manufacture more complex lenses. Fresnel lens design...
- m**** production. Typical rectilinear lenses can be thought of as "improved" pinhole "lenses". As shown, a pinhole "lens" is simply a small aperture that blocks...
- ensure that eye growth, which disrupts IOL lenses, will not occur post-surgery. Once implanted, IOL lenses have three major benefits. First, they are...
- radiation. In the absence of activating light the lenses return to their clear state. Photochromic lenses may be made of gl****, polycarbonate, or another...
- Aspheric lenses are also sometimes used for eyegl****es. Aspheric eyegl**** lenses allow for crisper vision than standard "best form" lenses, mostly when...
- multitude of lens shapes. For lower power lenses, there are few restrictions which allow for many trendy and fashionable shapes. Higher power lenses can cause...
- Some photographic zoom lenses are long-focus lenses, with focal lengths longer than a normal lens, some are wide-angle lenses (wider than normal), and...
- other effects of long-focus lenses are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred...
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