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A typical polymer has a refractive index of 1.30–1.70, but a higher refractive index is often required for specific applications. The refractive index is related to the molar refractivity, structure and weight of the monomer. In general, high molar refractivity and low molar volumes increase the refractive index of the polymer. [1]
Influences of selected glass component additions on the Abbe number of a specific base glass. [ 2 ] An Abbe diagram , also called 'the glass veil', is produced by plotting the Abbe number V d {\displaystyle V_{\mathsf {d}}} of a material versus its refractive index n d . {\displaystyle n_{\mathsf {d}}.}
Mid-index: 1.54 ≤ n d < 1.60; High-index: 1.60 ≤ n d < 1.74; Very high index: 1.76 ≤ n d; This is a general classification. Often for marketing purposes, materials with n d values that are at or above 1.60 can be referred to as "high-index". Likewise, Trivex and other borderline normal / mid-index materials may be referred to as mid-index.
The international glass code is based on U.S. military standard MIL-G-174, and is a six-digit number specifying the glass according to its refractive index n d at the Fraunhofer d- (or D 3-) line, 589.3 nm, and its Abbe number V d also taken at that line.
Moissanite lies at the other end of the range with a refractive index as high as 2.65. Most plastics have refractive indices in the range from 1.3 to 1.7, but some high-refractive-index polymers can have values as high as 1.76. [17] For infrared light refractive indices can be considerably higher.
In general, an index of refraction is a complex number with both a real and imaginary part, ... Plate glass (window glass) 1.52 [29] Crown glass (pure) 1.50–1.54: PETg:
Glass wool (for thermal insulation) Special optical glass (similar to Lead crystal) Fused silica Germania glass Germanium selenide glass Chemical composition, wt% 74 SiO 2, 13 Na 2 O, 10.5 CaO, 1.3 Al 2 O 3, 0.3 K 2 O, 0.2 SO 3, 0.2 MgO, 0.01 TiO 2, 0.04 Fe 2 O 3: 81 SiO 2, 12.5 B 2 O 3, 4 Na 2 O, 2.2 Al 2 O 3, 0.02 CaO, 0.06 K 2 O
The high ionic radius of the Pb 2+ ion renders it highly immobile in the matrix and hinders the movement of other ions; lead glasses therefore have high electrical resistance, about two orders of magnitude higher than soda–lime glass (10 8.5 vs 10 6.5 ohm·cm, DC at 250 °C or 482 °F). [11] Lead-containing glass is frequently used in light ...
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