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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.
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 ...
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 .
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".
[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.
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 ...
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 ...
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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