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Reference.org
Crown glass (optics)
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<p>Crown glass is a type of optical <a href="/facts/Glass/hezRsAGf">glass</a> used in <a href="/facts/Lens_(optics)/ejlH6n5c">lenses</a> and other optical components. It has relatively low <a href="/facts/Refractive_index/yjkzvgeE">refractive index</a> (≈1.52) and low <a href="/facts/Dispersion_(optics)/cUdHnYXz">dispersion</a> (with <a href="/facts/Abbe_number/lcWFqTw4">Abbe numbers</a> between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% <a href="/facts/Potassium_oxide/mmUVvPef">potassium oxide</a> and is one of the earliest <a href="/facts/Low_dispersion_glass/slw7Qpeh">low dispersion glasses</a>. </p>