polycarbonate lens!

polycarbonate lens

Comprehensive Analysis

1) "Polycarbonate" -- As to polycarbonate lens poly�car�bon�ate Pronunciation: -'kär-b&-"nAt, -n&t Function: noun : any of various tough transparent thermoplastics characterized by high impact strength and high softening temperature Pronunciation Symbols Polycarbonate Physical Properties Density (ρ) 1200-1220 kg/m³ Abbe number (V) 34.0 Refractive index (n) 1.584-6 Flammability V0-V2 Limiting oxygen index 25-27% Water absorption - Equilibrium(ASTM) 0.16-0.35% Water absorption - over 24 hours 0.1% Radiation resistance Fair Ultraviolet (1-380nm) resistance Fair Mechanical Properties Young's modulus (E) 2-2.4 GPa Tensile strength (σt) 55-75 MPa Compressive strength (σc) >80 MPa Elongation (ε) @ break 80-150% Poisson's ratio (ν) 0.37 Hardness - Rockwell M70 Izod impact strength 600-850 J/m Notch test 20-35 kJ/m² Abrasive resistance - ASTM D1044 10-15 mg/1000 cycles Coefficient of friction (μ) 0.31 Thermal Properties Melting temperature (Tm) 267°C* Glass transition temperature(Tg) 150°C Heat Deflection Temperature - 10 kN (Vicat B)[citation ..." 2) "Lens" -- As to polycarbonate lens 1lens Pronunciation: 'lenz Function: noun Etymology: New Latin lent-, lens, from Latin, lentil; from its shape 1 a : a piece of transparent material (as glass) that has two opposite regular surfaces either both curved or one curved and the other plane and that is used either singly or combined in an optical instrument for forming an image by focusing rays of light b : a combination of two or more simple lenses c : a piece of glass or plastic used (as in safety goggles or sunglasses) to protect the eye 2 : a device for directing or focusing radiation other than light (as sound waves, radio microwaves, or electrons) 3 : something shaped like a biconvex optical lens <lens of sandstone> 4 : a highly transparent biconvex lens-shaped or nearly spherical body in the eye that focuses light rays (as upon the retina) -- see EYE illustration 5 : something that facilitates and influences perception, comprehension, or evaluation <viewing the current legal battle...through partisan lenses -- New Republic> 6 : GRAVITATIONAL LENS - lensed /'lenzd/ adjective - lens�less /'lenz-l&s/ adjective Pronunciation Symbols A lens can be: Lens (optics), an optical element. See also Category:Lenses, and: Lens (anatomy), a part of the eye Corrective lens for vision correction Photographic lens, a special type of lens used in a camera. See also Category:Photographic lenses Sunglasses' lenses, which are light-attenuating elements Hence: Gravitational lens, an astronomical effect Electrostatic lens, a device used to focus or collimate electron beams a metaphor for a point of view a science-fictional alien device in E. E. Smith's Lensman series, which gives its bearer telepathic and other abilities Lens (genus), the genus of the lentil plant Lens (geometry), a geometric shape formed from two arcs Lens (geology), a body of ore or rock that is thick in the middle and thin at the edges There are also places called Lens: Lens, Pas-de-Calais, France RC Lens, its football (soccer) club Lens, Belgium Lens, Valais, Switzerland People named Lens include: Louis Lens, Flemish rose breeder Nicholas Lens, Belgian composer LENS can be an acronym for: Laser Engineered Net Shaping, a rapid prototyping technology capable of building fully-dense metal parts ..." 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