- published: 26 Nov 2015
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Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers around 60). Crown glass is produced from alkali-lime (RCH) silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses.
As well as the specific material named crown glass, there are other optical glasses with similar properties that are also called crown glasses. Generally, this is any glass with Abbe numbers in the range 50 to 85. For example, the borosilicate glass Schott BK7 is an extremely common crown glass, used in precision lenses. Borosilicates contain about 10% boric oxide, have good optical and mechanical characteristics, and are resistant to chemical and environmental damage. Other additives used in crown glasses include zinc oxide, phosphorus pentoxide, barium oxide, fluorite and lanthanum oxide.
A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet. The dispersions of the glasses partially compensate for each other, producing reduced chromatic aberration compared to a singlet lens with the same focal length.
Crown glass is either of two kinds of glass:
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Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index and low dispersion. Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses. As well as the specific material named crown glass, there are other optical glasses with similar properties that are also called crown glasses. Generally, this is any glass with Abbe numbers in the range 50 to 85. For example, the borosilicate glass Schott BK7 is an extremely common crown glass, used in precision lenses. Borosilicates contain about 10% boric oxide, have good optical and mechanical characteristics, and are resistant to chemical and environmental damage. Other additives used in crown glasse...
Have you ever seen Photochromic lenses in action? Check out the video to see how Spotters Photochromic lenses work and see the triple activation for yourself
S.K. Enterprise Auto Hand Edgar special Optical Glass Grinding machine for optical glass frame fitting and shaping all in single machine. A auto Edgar quality wheel is fitted in normal Edgar so economical in cost and fast in work. Specialty Developed cutter attachment for C.R./ Poly Carbonate & Glass Lens with buffing attachment. By this machine powder spreading in almost nil so it helps environment and health. This machine can give mass production quality. This machine comes in different colors with 5"(125mm) and 6"(150mm) Diamiter Auto Edgar Quality Diamond Wheel. Contact : 9898255565 Arun Patel.
This film clip shows the manufacture of glass for optical instruments and eyewear used in industry and war. The glass is melted in special pots and furnaces, stirred after founding, and allowed to cool in situ. When cold it is broken up and examined. Defective glass is rejected, and the good glass is molded into slabs, prisms or lenses, and finally annealed. Optical glass has to conform to a rigorous specification. It must have certain specified optical constants, must be free from striae, bubble, strain, and color, and must be durable. Lenses and prisms, used in microscopes, telescopes and other optical instruments, are only as good as their glass. Optical-quality glass must be flawless. Even tiny flecks, streaks, or bubbles can cause distortion. During World War II, optical glass was ...
Optics 4th/5th Edition Problem 4-45 Eugene Hecht QUESTION: 4.45* Compare the amplitude reflection coefficients for an air-water (nw = 4/3) interface with that of an air-crown glass (ng = 3/2) inter- face, both at near-normal incidence. What are the corresponding ratios of the reflected to the incident irradiances?
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No camera could be complete without a lens - the glass technology that brings the world into focus. Dive into the history of the lens from it's early beginning as a fire starting tool to the plethora of modern designs.
The Labor Day weekend of 2013 turned out to be the official maiden voyage of this 1995 Ford Crown Victoria LX after the engine/transmission swap. There is still allot of work to be done, but the major work is complete and the car is ready to be registered, titled, and inspected. Items remaining thus far are: - Replace all upper and lower ball joints - Replace both front anti-sway bar end links - Re-install left and right plastic rocker molding after sourcing new fasteners - Order and install new driver's side parking/side marker lens assembly - Add one more can of R-134a refrigerant - Swap both head light assemblies with those of the wrecked car - Swap rear axle and drive shaft assembly - Diagnose and repair ABS warning light - Swap all brake calipers and bleed system - Swap trunk weather...
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Describes (in partly animated form: "talking gasoline drops," etc!) the refining of gasoline, its chemical breakdown, etc; excellent shots of gasoline stations (with the "Royal Crown" glass globes atop the gas pumps; striking images), and oil refineries. Good shots fo stop light changing from red to green; driver's POV on Western highway; CU speedometer accelerating to 50 MPH; CU gas jet stovetop; beautiful Chrysler "Town and Country" ("Woody") on rural highway. 08:52:48:00 - 09:15:21:00 Color Sound c. 1946 "The Inside Story of Modern Gasoline" presented by Standard Oil Company (Indiana). A Leadership Through Science film. Animation (funny shapes based on construction of molecules) used to demonstrate how gas made, refined & improved. Experiments in volatility, prevention of fuel knock,...
Namaste and Hello, This is KP, BP and VB. We love technology and gadgets. Here is the feb 12th installment of the show. Join us and share techie news. Dont forget to give thumbs up if you like what we do and visit https://www.facebook.com/thetechietalk for more information on our show and news. Scientist X ray vision It is already possible to peer inside the body with X-rays and ultrasound. But the images produced by such tools are crude compared with those that should be possible with visible light. Partly this is because visible-light images tend to have higher resolution www.nature.com/news/optics-super-vision-1.16877 Nokia N1 Tablet iPad Clone www.androidcentral.com/nokia-n1-tabl…iliar-looking www.youtube.com/watch?v=0-J0FWWDuRg Apple Watch Update Digital Crown A Retina dis...