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Abbe number. In optics and lens design, the Abbe number, also known as the V-number or constringence of a transparent material, is an approximate measure of the material's dispersion (change of refractive index versus wavelength), with high values of V indicating low dispersion. It is named after Ernst Abbe (1840–1905), the German physicist ...
The Abbe number for a material at a particular refractive index formulation is usually specified as its Abbe value. In practice, an Abbe number change from 30 to 32 will not have a practically noticeable benefit, but a change from 30 to 47 could be beneficial for users with strong prescriptions that move their eyes and look "off-axis" of the ...
The monomer is allyl diglycol carbonate (ADC). The term CR-39 technically refers to the ADC monomer, but is more commonly used to refer to the finished plastic. The abbreviation stands for "Columbia Resin #39", which was the 39th formula of a thermosetting plastic developed by the Columbia Resins project in 1940. [ 1]
As of 2024, 334 Latin songs have entered the Hot 100 chart, 1 in 1950s, 1 in 1960s, 2 in 1970s, 1 in 1980s, 5 in 1990s, 36 in 2000s, 80 in 2010s and 208 in 2020s. A total of 22 singles managed to reach the top 10 and 4 have peaked at number 1. Only 5 Latin songs reached the top 10 between 1958 and 2016. Puerto Rican singer Bad Bunny is the act ...
1 Chart history. 2 See also. 3 References. Toggle the table of contents. ... This is a list of the Spanish Singles number-ones of 1979. Chart history. Issue Date
1 Chart history. 2 See also. 3 References. Toggle the table of contents. List of number-one singles of 1983 (Spain) ... This is a list of the Spanish Singles number ...
1 Chart history. 2 See also. 3 References. Toggle the table of contents. List of number-one singles of 1991 (Spain) ... This is a list of the Spanish PROMUSICAE Top ...
1 Chart history. 2 See also. 3 References. ... This is a list of the Spanish PROMUSICAE Top 20 Singles number-ones of 1990. Chart history. Issue Date Song Artist