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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.
The shortest wavelength's index is , and the longest's is . Abbe numbers are used to classify glass and other optical materials in terms of their chromaticity . For example, the higher dispersion flint glasses have relatively small Abbe numbers V < 55 {\displaystyle V<55} whereas the lower dispersion crown glasses have larger Abbe numbers.
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.
A typical polymer has a refractive index of 1.30–1.70, but a higher refractive index is often required for specific applications. The refractive index is related to the molar refractivity, structure and weight of the monomer. In general, high molar refractivity and low molar volumes increase the refractive index of the polymer. [1]
Thomas Edison with phonograph in the late 1870s. Edison was one of the most prolific inventors in history, holding 1,093 U.S. patents in his name.. Innovation is the practical implementation of ideas that result in the introduction of new goods or services or improvement in offering goods or services. [1]
Kobe Bean Bryant (/ ˈ k oʊ b i / KOH-bee; August 23, 1978 – January 26, 2020) was an American professional basketball player. A shooting guard, he spent his entire 20-year career with the Los Angeles Lakers in the National Basketball Association (NBA).
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