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  2. Optical coating - Wikipedia

    en.wikipedia.org/wiki/Optical_coating

    Comparison of uncoated glasses (top) and glasses with an anti-reflective coating (bottom). Antireflection coatings are used to reduce reflection from surfaces. Whenever a ray of light moves from one medium to another (such as when light enters a sheet of glass after travelling through air ), some portion of the light is reflected from the ...

  3. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

  4. Color blindness - Wikipedia

    en.wikipedia.org/wiki/Color_blindness

    Tinted glasses (e.g. Pilestone/Colorlite glasses) apply a tint (e.g. magenta) to incoming light that can distort colors in a way that makes some color tasks easier to complete. These glasses can circumvent many color vision tests, though this is typically not allowed. [62] Glasses with a notch filter (e.g. EnChroma glasses) filter a narrow band ...

  5. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    Possible lightness values are 15% through 90% in steps of 5% for monochromatic shades of grey (i.e. C = 0%) and 20% through 90% in steps of 10% and additionally 85% and 93%. Chroma values are also mostly confined to steps of 10% or 5%, but with some exceptions, and the maximum value varies.

  6. Shades of gray - Wikipedia

    en.wikipedia.org/wiki/Shades_of_gray

    This is an accepted version of this page This is the latest accepted revision, reviewed on 8 January 2025. Variations of the color gray This article is about variations of the color gray. For other uses, see Shades of gray (disambiguation). For the 2011 novel, see Fifty Shades of Grey. For its 2015 film adaptation, see Fifty Shades of Grey (film). For the novel series, see Fifty Shades (novel ...

  7. Neutral-density filter - Wikipedia

    en.wikipedia.org/wiki/Neutral-density_filter

    In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter, and is denoted by Wratten number 96. The purpose of a standard photographic neutral ...

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