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Plate glass (window glass) 1.52 [29] Crown glass (pure) 1.50–1.54: PETg: 1.57: Polyethylene terephthalate (PET) 1.5750: Polycarbonate: 150: 1.60 [30] Crown glass (impure) 1.485–1.755: Flint glass (pure) 1.60–1.62: Bromine: 1.661: Flint glass (impure) 1.523–1.925: Sapphire: 1.762–1.778: Boron nitride: 2–2.14 [31] Cubic zirconia: 2.15 ...
Note that T = 0 for the glass substrate in the DUV, indicating absorption in this range of the spectrum. It is found that the value of k(λ) in the deep UV wavelength range is of the order of k = 3 × 10 −4, and this small non-zero value is consistent with T = 0 in the deep UV.
A ray of light being refracted through a glass slab Refraction of a light ray. In optics, the refractive index (or refraction index) of an optical medium is the ratio of the apparent speed of light in the air or vacuum to the speed in the medium. The refractive index determines how much the path of light is bent, or refracted, when entering a ...
Soda–lime glass (for containers) [2] Borosilicate (low expansion, similar to Pyrex, Duran) 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. ...
Values of range from below 25 for very dense flint glasses, around 34 for polycarbonate plastics, up to 65 for common crown glasses, and 75 to 85 for some fluorite and phosphate crown glasses. Most of the human eye's wavelength sensitivity curve, shown here, is bracketed by the Abbe number reference wavelengths of 486.1 nm (blue) and 656.3 nm (red)
The C-values are the glass component concentrations like Na 2 O or CaO in percent or other fractions, the b-values are coefficients, and n is the total number of glass components. The glass main component silica (SiO 2 ) is excluded in the equation below because of over-parametrization due to the constraint that all components sum up to 100%.
Indo-Pacific beads are a type of mainly tube drawn glass beads which originated in the Indian subcontinent but are manufactured widely in Southeast Asia.These are usually 6mm in diameter, undecorated and come in various colours for example green, yellow, black, opaque red, etc.
The resulting glass code is the value of n d − 1 rounded to three digits, followed by V d rounded to three digits, with all decimal points ignored. For example, BK7 has n d = 1.5168 and V d = 64.17, giving a six-digit glass code of 517642. [1] Consequently, a linear approximation for the refractive index dispersion close that wavelength is ...