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  2. Optical glass - Wikipedia

    en.wikipedia.org/wiki/Optical_glass

    Optical glass refers to a quality of glass suitable for the manufacture of optical systems such as optical lenses, prisms or mirrors.Unlike window glass or crystal, whose formula is adapted to the desired aesthetic effect, optical glass contains additives designed to modify certain optical or mechanical properties of the glass: refractive index, dispersion, transmittance, thermal expansion and ...

  3. List of lens designs - Wikipedia

    en.wikipedia.org/wiki/List_of_lens_designs

    This list covers optical lens designs grouped by tasks or overall type. The field of optical lens designing has many variables including the function the lens or group of lenses have to perform, the limits of optical glass because of the index of refraction and dispersion properties, and design constraints including realistic lens element center and edge thicknesses, minimum and maximum air ...

  4. Photographic lens design - Wikipedia

    en.wikipedia.org/wiki/Photographic_lens_design

    The new Jena optical glass also opened up the possibility of increased performance of photographic lenses. The first use of Jena glass in a photographic lens was by Voigtländer, but as the lens was an old design its performance was not greatly improved.

  5. File:Border Range.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Border_Range.pdf

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  6. Precision glass moulding - Wikipedia

    en.wikipedia.org/wiki/Precision_glass_moulding

    Precision glass moulding: In this step the preform is directly formed into an optical glass lens. It is necessary to clean the glass preform and the mould before starting the process, but there is no polishing or post-machining required. Lens coating: An antireflection coating is applied to the finished lenses. The lenses are first cleaned, and ...

  7. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    There are currently two basic methods to achieve variable focal length: electro-optical and opto-mechanical. Electro-optical often uses liquid crystals as the active medium. [1] Applying an electric potential to the liquid changes the refraction of the liquid. Early work on opto-mechanical methods was done by Martin Wright.

  8. Optical lens design - Wikipedia

    en.wikipedia.org/wiki/Optical_lens_design

    Optical lens design is the process of designing a lens to meet a set of performance requirements and constraints, including cost and manufacturing limitations. Parameters include surface profile types (spherical, aspheric, holographic, diffractive, etc.), as well as radius of curvature, distance to the next surface, material type and optionally tilt and decenter.

  9. Zone plate - Wikipedia

    en.wikipedia.org/wiki/Zone_plate

    To get constructive interference at the focus, the zones should switch from opaque to transparent at radii where [3] = + where n is an integer, λ is the wavelength of the light the zone plate is meant to focus and f is the distance from the center of the zone plate to the focus.