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  2. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Mid-index: 1.54 ≤ n d < 1.60; High-index: 1.60 ≤ n d < 1.74; Very high index: 1.76 ≤ n d; This is a general classification. Often for marketing purposes, materials with n d values that are at or above 1.60 can be referred to as "high-index". Likewise, Trivex and other borderline normal / mid-index materials may be referred to as mid-index.

  3. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. Refraction of a light ray. The refractive index determines how much the path of light is bent, or refracted, when entering a material. This is described by Snell's law of ...

  4. List of refractive indices - Wikipedia

    en.wikipedia.org/wiki/List_of_refractive_indices

    List of refractive indices. Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers .

  5. List of highest-grossing R-rated films - Wikipedia

    en.wikipedia.org/wiki/List_of_highest-grossing_R...

    This is a list of the highest-grossing R-rated films. An R-rated film is a film that has been assessed as having material which may be unsuitable for children under the age of 17 by the Motion Picture Association; the MPA writes "Under 17 requires accompanying parent or adult guardian".

  6. List of highest-grossing films in the United States and ...

    en.wikipedia.org/wiki/List_of_highest-grossing...

    [1] [2] The chart is ranked by lifetime gross, and for comparison, the figures adjusted for the effects of inflation are also listed, using the U.S. consumer price index; [4] a film's earnings from its initial release are also included to provide a basis for comparison between films released around the same time.

  7. List of highest-grossing films - Wikipedia

    en.wikipedia.org/wiki/List_of_highest-grossing_films

    Three of the four highest-grossing films, including Avatar at the top, were written and directed by James Cameron.. With a worldwide box-office gross of over $2.9 billion, Avatar is proclaimed to be the "highest-grossing" film, but such claims usually refer to theatrical revenues only and do not take into account home video and television income, which can form a significant portion of a film ...

  8. Polycarbonate - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate

    Polycarbonate. Polycarbonates ( PC) are a group of thermoplastic polymers containing carbonate groups in their chemical structures. Polycarbonates used in engineering are strong, tough materials, and some grades are optically transparent. They are easily worked, molded, and thermoformed. Because of these properties, polycarbonates find many ...

  9. List of Academy Award–winning films - Wikipedia

    en.wikipedia.org/wiki/List_of_Academy_Award...

    Films with the most awards: Ben-Hur ( 1959 ), Titanic ( 1997 ), and The Lord of the Rings: The Return of the King ( 2003) each earned 11 Academy Awards. Films with the most nominations: All About Eve ( 1950 ), Titanic ( 1997 ), and La La Land ( 2016) each earned 14 Academy Award nominations. Film with the highest clean sweep: The Lord of the ...

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