Definition of lens or glass. Meaning of lens or glass. Synonyms of lens or glass

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

Definition of lens or glass

lens or glass
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 lens or glass from wikipedia

- A magnifying gl**** is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. Beyond...
- activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Gl**** lenses use visible light...
- compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as gl**** or plastic...
- A camera lens (also known as photographic lens or photographic objective) is an optical lens or ****embly of lenses used in conjunction with a camera body...
- astigmatism, and presbyopia. Gl****es or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface...
- objective itself is usually a cylinder containing one or more lenses that are typically made of gl****; its function is to collect light from the sample....
- An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected...
- gl**** refers to a quality of gl**** suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors. Unlike window gl**** or crystal...
- A Fresnel lens (/ˈfreɪnɛl, -nəl/ FRAY-nel, -⁠nəl; /ˈfrɛnɛl, -əl/ FREN-el, -⁠əl; or /freɪˈnɛl/ fray-NEL) is a type of composite compact lens which reduces...
- Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over...