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Rakuten. Get cash back at more than 3,500 stores with payouts every quarter. 💰 The basics. Free to use. Sign up online or on the app. Save money at Rakuten, through the app or with a browser ...
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.
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 .
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.
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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 ...
A lenticular lens is an array of lenses, designed so that when viewed from slightly different angles, different parts of the image underneath are shown. [ 1][ 2][failed verification – see discussion] The most common example is the lenses used in lenticular printing, where the technology is used to give an illusion of depth, or to make images ...
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 ...