When.com Web Search

  1. Ads

    related to: buy concave and convex lens

Search results

  1. Results From The WOW.Com Content Network
  2. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    A lens with one convex and one concave side is convex-concave or meniscus. Convex-concave lenses are most commonly used in corrective lenses, since the shape minimizes some aberrations. For a biconvex or plano-convex lens in a lower-index medium, a collimated beam of light passing through the lens converges to a spot (a focus) behind

  3. List of lens designs - Wikipedia

    en.wikipedia.org/wiki/List_of_lens_designs

    Simple lenses are lenses consisting of a single element. Lenses in this section may overlap with lens designs in other sections, for example the Wollaston landscape lens is a single element and also a camera lens design. Basic types. Biconcave lens; Biconvex lens; Convex-concave lens; Plano concave lens; Plano convex lens; Meniscus lens; Designs

  4. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Although corrective lenses can be produced in many different profiles, the most common is ophthalmic or convex-concave. In an ophthalmic lens, both the front and back surfaces have a positive radius, resulting in a positive/convergent front surface and a negative/divergent back surface.

  5. Vergence (optics) - Wikipedia

    en.wikipedia.org/wiki/Vergence_(optics)

    For concave lenses, the focal point is on the back side of the lens, or the output side of the focal plane, and is negative in power. A lens with no optical power is called an optical window, having flat, parallel faces. The optical power directly relates to how large positive images will be magnified, and how small negative images will be ...

  6. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    For a thin lens in air, the focal length is the distance from the center of the lens to the principal foci (or focal points) of the lens.For a converging lens (for example a convex lens), the focal length is positive and is the distance at which a beam of collimated light will be focused to a single spot.

  7. Aspheric lens - Wikipedia

    en.wikipedia.org/wiki/Aspheric_lens

    Like other lenses for vision correction, aspheric lenses can be categorized as convex or concave. Convex aspheric curvatures are used in many presbyopic vari-focal lenses to increase the optical power over part of the lens, aiding in near-pointed tasks such as reading. The reading portion is an aspheric "progressive add".