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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)
Reducing frame lens size will give the most noticeable improvement in weight for a given material. Ways to reduce the weight and thickness of corrective lenses, in approximate order of importance are these: Choose glasses frames with small lenses; that is to say so that the longest measurement across the lens at any angle is as short as possible.
A watch with a plano-convex lens over the date indicator. A single convex lens mounted in a frame with a handle or stand is a magnifying glass. Lenses are used as prosthetics for the correction of refractive errors such as myopia, hypermetropia, presbyopia, and astigmatism. (See corrective lens, contact lens, eyeglasses, intraocular lens.)
Lenses produced for 35 mm film cameras may mount well on the digital bodies, but the larger image circle of the 35 mm system lens allows unwanted light into the camera body, and the smaller size of the image sensor compared to 35 mm film format results in cropping of the image. This latter effect is known as field-of-view crop.
Lens (human) 1.386–1.406: Liver (human) 964: 1.369 [22] Intestinal mucosa (human) 964: 1.329–1.338 [23] Ethylene tetrafluoroethylene : 1.403 [24] Sylgard 184 (polydimethylsiloxane) 1.4118 [25] Sugar solution, 50%: 1.4200 [20] Polylactic acid: 1.46 [26] Pyrex (a borosilicate glass) 1.470 [27] Vegetable oil: 1.47 [28] Glycerol: 1.4729: Sugar ...
Gardner Flint Minshew II (born May 16, 1996) is an American professional football quarterback for the Las Vegas Raiders of the National Football League (NFL). He began his college football career with the Northwest Mississippi Rangers, where he won the NJCAA National Football Championship, and played his next two years for the East Carolina Pirates.