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Aviator sunglasses. F.W. Hunter, Army test pilot, with AN 6531 sunglasses (1942) Aviator sunglasses are a style of sunglasses that was developed by a group of American firms. The original Bausch & Lomb design is now commercially marketed as Ray-Ban Aviators, although other manufacturers also produce aviator-style sunglasses.
Ray-Ban Wayfarer sunglasses and eyeglasses have been manufactured by Ray-Ban since 1952. Made popular in the 1950s and 1960s by music and film icons such as Buddy Holly , Roy Orbison and James Dean , Wayfarers almost became discontinued in the 1970s, before a major resurgence was created in the 1980s through massive product placements .
Pencil (optics) In optics, a pencil or pencil of rays is a geometric construct used to describe a beam or portion of a beam of electromagnetic radiation or charged particles, typically in the form of a narrow beam ( conical or cylindrical ). Antennas which strongly bundle in azimuth and elevation are often described as "pencil-beam" antennas.
Clorox Disinfecting Wipes (pack of 3) $12 $15 Save $3. Clorox Disinfecting Wipes are an essential around the house, from cleaning up after kids, to wiping down the kitchen and bathroom between ...
Amazon's annual Prime Day event is well underway — with day 2 deals ending later today, July 17th, in fact — but if you're skeptical about whether or not the deals are actually worth your time ...
This Prime Day I'd like to stock up on more pairs if they're on sale. Choose from an overwhelming 27 colors and prints — the Black and Gray Stripes are a personal favorite . They're available in ...
The numerical aperture with respect to a point P depends on the half-angle, θ1, of the maximum cone of light that can enter or exit the lens and the ambient index of refraction. As a pencil of light goes through a flat plane of glass, its half-angle changes to θ2. Due to Snell's law, the numerical aperture remains the same: NA = n1 sin θ1 ...
Luxottica. Luxottica Group S.p.A. is an Italian eyewear conglomerate based in Milan. As a vertically integrated company, Luxottica designs, manufactures, distributes, and retails its eyewear brands all through its own subsidiaries. The company, presently organized as a subsidiary of EssilorLuxottica which formed when the Italian conglomerate ...
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