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Rakuten Rewards was founded as Ebates in 1998 in Menlo Park, California, by two former deputy district attorneys, Alessandro Isolani and Paul Wasserman. Funded by the venture capital firm Foundation Capital , [6] Ebates.com was launched on 3 May 1999, offering up to 25% cash back from about 40 online retailers.
In an achromatic lens, two wavelengths are brought into the same focus, here red and blue. An achromatic lens or achromat is a lens that is designed to limit the effects of chromatic and spherical aberration. Achromatic lenses are corrected to bring two wavelengths (typically red and blue) into focus on the same plane.
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 between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses .
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A Claude glass (or black mirror) is a small mirror, slightly convex in shape, with its surface tinted a dark colour. Bound up like a pocket-book or in a carrying case, Claude glasses were used by artists, travelers and connoisseurs of landscape and landscape painting. Claude glasses have the effect of reducing and simplifying the colour and ...
July 20, 2024 at 4:07 AM. Earth surrounded by a cloud of satellites. Image source: Getty Images. After years of delays, in October 2023 Amazon (NASDAQ: AMZN) took its first step toward offering ...
The glass–liquid transition, or glass transition, is the gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or rubbery state as the temperature is increased. [2] An amorphous solid that exhibits a glass transition ...
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