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Crown glass (optics) - Wikipedia 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
Crown glass | Making, Properties Uses | Britannica crown glass, handmade glass of soda-lime composition for domestic glazing or optical uses The technique of crown glass remained standard from the earliest times: a bubble of glass, blown into a pear shape and flattened, was transferred to the glassmaker’s pontil (a solid iron rod), reheated and rotated at speed, until centrifugal force
Optical Glass - Edmund Optics Crown glasses tend to have lower dispersion than flints Transmission Standard optical glasses offer high transmission throughout the entire visible spectrum and beyond in the near-ultraviolet and near-infrared ranges ( Figure 1 )
Optical Glasses - HyperPhysics The most common types of glasses used in optics are crown glasses and flint glasses, designations based on their dispersions Flint glasses contain lead These designations are further subdivided by composition and have letter designations and number designations called "glass numbers"
B 270® - Schott AG The crown glass B 270® is designed to deliver consistent transmittance of light across a range of wavelengths, from ultraviolet to near-infrared
Index of Refraction of Glass, Crown - The Physics Factbook Crown glass is also used for optical glasses that are used in compound lenses It has a lower refractive index and less dispersion than flint glass, but is more durable Based of the research, crown glass has a refractive index in the range of 1 5 to 1 6