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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]
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.
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 fifteenth cycle of America's Next Top Model premiered on September 8, 2010 and was the ninth cycle to be aired on The CW network. [1]Several changes were made to the show in a bid to place greater emphasis on high fashion, including a lineup of prominent fashion industry guest judges and photographers as well as a change in prizes.
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.
An Austin, Texas firefighting company is decimated in a fire accident. FDNY Captain Owen Strand, having rebuilt his own team after 9/11, is offered the job, but he declines. Strand learns he has lung cancer, and saves his son TK from a drug overdose. Strand accepts the job and brings TK with him, to lead a new diverse team of firefighters.
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