Crown glass (optics)
Type of glass / From Wikipedia, the free encyclopedia
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Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses.
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This article is about crown glass as used in optics. For the window glass, see Crown glass (window).