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I also opted for blue light lenses, which added another $28. Plus tax, my total was $90.14 for the pair. Here are some of the best glasses we're seeing on sale during Black Friday.
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Warby Parker Inc. is an American manufacturer and retailer of prescription glasses, contact lenses, and sunglasses, based in New York City. Founded in 2010, it was initially an online-only retailer. It now receives about 90% of its revenue from its 237 physical retail stores, 232 of which are in the U.S. and 5 of which are in Canada. [1]
For the simplified scenario of visible light travelling from air (n 0 ≈ 1.0) into common glass (n S ≈ 1.5), the value of R is 0.04, or 4%, on a single reflection. So at most 96% of the light (T = 1 − R = 0.96) actually enters the glass, and the rest is reflected from the surface. The amount of light reflected is known as the reflection loss.
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 ...
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