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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.
In a roof prism without a phase-correcting coating, s-polarized and p-polarized light each acquire a different geometric phase as they pass through the upper prism. When the two polarized components are recombined, interference between the s-polarized and p-polarized light results in a different intensity distribution perpendicular to the roof ...
The Google Glass prototype resembled standard eyeglasses with the lens replaced by a head-up display. [21] In mid-2011, Google engineered a prototype that weighed 8 pounds (3.6 kg); [22] by 2013 they were lighter than the average pair of sunglasses. [1] A Glass prototype seen at Google I/O in June 2012. The product was publicly announced in ...
"The Glasses" is the third episode of the fifth season of the American sitcom Seinfeld. The 67th episode of the series overall, it was written by the writing team Tom Gammill and Max Pross, their debut for the series, and directed by Tom Cherones.
The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.
At one time, they were officially designated as regulation prescription glasses (RPGs). [ citation needed ] This was commonly said to mean "rape prevention glasses" due to their unstylish appearance. [ citation needed ] At times in the US Navy they were called to " Standard Navy Ugly Glasses " ( SNUGs ).
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