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Values of range from below 25 for very dense flint glasses, around 34 for polycarbonate plastics, up to 65 for common crown glasses, and 75 to 85 for some fluorite and phosphate crown glasses. Most of the human eye's wavelength sensitivity curve, shown here, is bracketed by the Abbe number reference wavelengths of 486.1 nm (blue) and 656.3 nm (red)
Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...
A watch with a plano-convex lens over the date indicator. A single convex lens mounted in a frame with a handle or stand is a magnifying glass. Lenses are used as prosthetics for the correction of refractive errors such as myopia, hypermetropia, presbyopia, and astigmatism. (See corrective lens, contact lens, eyeglasses, intraocular lens.)
Lens (human) 1.386–1.406: Liver (human) 964: 1.369 [22] Intestinal mucosa (human) 964: 1.329–1.338 [23] Ethylene tetrafluoroethylene : 1.403 [24] Sylgard 184 (polydimethylsiloxane) 1.4118 [25] Sugar solution, 50%: 1.4200 [20] Polylactic acid: 1.46 [26] Pyrex (a borosilicate glass) 1.470 [27] Vegetable oil: 1.47 [28] Glycerol: 1.4729: Sugar ...
The development of the 'Tessar' lens is discussed by Nasse, [11] and shows its transformation from an f /6.3 lens for plate cameras using the original three-group configuration through to an f /2.8 5.2 mm four-element optic with eight extremely aspheric surfaces, economically manufacturable because of its small size. Its performance is 'better ...
One of the richest celebrities, as of 2021, Rihanna is the world's wealthiest female musician with an estimated net worth of $1.7 billion. [260] She was also listed among Forbes ' Top 100 Most Powerful Women of 2019. [261] In 2020, she debuted on the Sunday Times Rich List, claiming third place on the list of Britain's richest musicians. [262]
Karl Otto Lagerfeld [1] was born in Hamburg on 10 September 1933 to Elisabeth (née Bahlmann) and Otto Lagerfeld.His father, coming from a family of wealthy wine-merchants, was a prosperous businessman and polyglot, speaking nine languages; [7] [8] his father owned an import company (Lagerfeld & Co.) specialising in evaporated milk, leading him to work with the American dairy company Carnation.
[65] His use of methods involving "one or more orders of the infinitesimally small" is present in his De motu corporum in gyrum of 1684 [66] and in his papers on motion "during the two decades preceding 1684". [67] Newton in 1702 by Godfrey Kneller. Newton had been reluctant to publish his calculus because he feared controversy and criticism. [68]
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