Lens - definizione. Che cos'è Lens
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Cosa (chi) è Lens - definizione

OPTICAL DEVICE WHICH TRANSMITS AND REFRACTS LIGHT
Convex lens; Concave lens; Lenses; Optical lens; Thin Lens Formula; Thin lens formula; Lens maker's formula; Lens Maker's Formula; Lens formula; Lens Formula; Diverging lens; Lens maker equation; Lensmaker's equation; Lens maker's equation; Lens makers equation; Converging lens; Biconvex lens; Biconcave lens; Convex Lens; Meniscus lens; Crystal Lens; Curved lens; Spherical lens; Convex lenses; Compound lens; Lensmaker's formula; Lensmakers' equation; Lensmakers' forumula; Lensmakers forumula; Lensmakers equation; Lensmaker equation; Lensmaker formula; Plano-convex lens; Double convex lens; Plano-concave lens; Convex-concave lens; Negative lens; Equiconvex lens; Real-is-positive convention; Lens equation; Biconcave; Planoconcave; Plus lens; Convexo-concave lens; Minus lens; Conventional lens; LENS; Singlet (lens); Double-convex lens; Double concave lens; Double-concave lens; Bi-convex lens; Bi-concave lens; Double-convex converging lens; Double convex converging lens; Biconvex converging lens; Bi-convex converging lens; Double-concave diverging lens; Biconcave diverging lens; Bi-concave diverging lens; Double concave diverging lens; Meniscus (optics); Positive lens; Plano-concave; Planoconvex lens; Lens (optics); Optical lenses
  • A biconvex lens
  • 400px
  • Close-up view of a flat [[Fresnel lens]].
  • LSST]], a planned sky surveying telescope
  • 250px
  • 400px
  • Lenses can be used to focus light
  • Types of lenses
  • Meniscus lenses: negative (top) and positive (bottom)
  • Light being refracted by a spherical glass container full of water. [[Roger Bacon]], 13th century
  • An aspheric biconvex lens.
  • The position of the focus of a spherical lens depends on the radii of curvature of the two facets.
  • A watch with a plano-convex lens over the date indicator
  • Images of black letters in a thin convex lens of focal length ''f'' are shown in red. Selected rays are shown for letters '''E''', '''I''' and '''K''' in blue, green and orange, respectively. '''E''' (at 2''f'') has an equal-size, real and inverted image; '''I''' (at ''f'') has its image at [[infinity]]; and '''K''' (at ''f''/2) has a double-size, virtual and upright image.

lens         
n.
1) to grind a lens
2) a concave; convex; crystalline; telephoto. telescopic lens
3) contact; corrective lenses
Lens         
·noun 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.
lens         
(lenses)
Frequency: The word is one of the 3000 most common words in English.
1.
A lens is a thin curved piece of glass or plastic used in things such as cameras, telescopes, and pairs of glasses. You look through a lens in order to make things look larger, smaller, or clearer.
...a camera lens...
I packed your sunglasses with the green lenses.
N-COUNT
2.
In your eye, the lens is the part behind the pupil that focuses light and helps you to see clearly.
N-COUNT: usu sing
3.

Wikipedia

Lens

A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic and are ground, polished, or molded to the required shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses.

Lenses are used in various imaging devices like telescopes, binoculars, and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia.

Esempi dal corpus di testo per Lens
1. In the cataract surgery technique, the whole lens is replaced with a lens adjusted to the patient‘s glasses prescription.
2. Lens (France). Group D: Grasshoppers (Switzerland) vs.
3. Each pair of the specially–fitted goggles has a lens designed to ease myopia over the left eye and a zero–powered lens over the right.
4. Kezich chronicles Federico Fellini‘s life through the lens of friendship.
5. Use your lens at its longest setting to give a flattering effect to features – going in close with a wide–angle lens will distort their faces.