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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)
Some representative refractive indices; Name of material λ (nm) Refractive index no. n Reference Vacuum: 1 (by definition) Air at STP: 1.000273 [citation needed]Gases at 0 °C and 1 atm
Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.
A burning apparatus consisting of two biconvex lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.
American Greetings Corporation is a privately held American company and is the world's second largest greeting card producer behind Hallmark Cards. [2] [3] Based in Westlake, Ohio, a suburb of Cleveland, the company sells paper greeting cards, electronic greeting cards, gift packaging, stickers and party products.
At his induction, his eyesight without glasses was unacceptable 20/50 in the right eye and 20/400 in the left (past the standard for legal blindness). [36] The second time he took the test, he passed by secretly memorizing the eye chart. [37] He was described as 5 feet 10 inches tall, gray eyed, dark haired and of light complexion. [38]
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