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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.
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]
CR-39 is about half the weight of glass with an index of refraction only slightly lower than that of crown glass, and its high Abbe number yields low chromatic aberration, altogether making it an advantageous material for eyeglasses and sunglasses. A wide range of colors can be achieved by dyeing of the surface or the bulk of the material.
The refractive index of water at 20 °C for visible light is 1.33. [1] The refractive index of normal ice is 1.31 (from List of refractive indices). In general, an index of refraction is a complex number with real and imaginary parts, where the latter indicates the strength of absorption loss at a particular wavelength. In the visible part of ...
The girls did a high fashion shoot for Solstice sunglasses featuring designs by Dior, Max Mara, Burberry, Gucci & Giorgio Armani. April had mixed reviews, Camille looked pigeon-toed and was the photographer's least favorite, Mercedes looked commercial, Yoanna hid her body well and Shandi took some of the photographer's best shots all year.
Farmer Wants a Wife is an American reality television series, based on the British show of the same name, in which a bachelor farmer chooses a potential romantic partner among a group of 10 single city women.
In gaseous form, small quantities of helium are supplied in high-pressure cylinders holding as much as 8 m 3 (approximately . 282 standard cubic feet), while large quantities of high-pressure gas are supplied in tube trailers, which have capacities of as much as 4,860 m 3 (approx. 172,000 standard cubic feet).
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