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A photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation. In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken.
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 merged with ...
Sunglasses of this type are sometimes called mirrorshades. A mirror coating does not get hot in sunlight and it prevents scattering of rays in the lens bulk. Sunglass lenses are made of either glass, plastic, or SR-91. Plastic lenses are typically made from acrylic, polycarbonate, CR-39 or polyurethane.
Glasses. Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Glasses are typically used for vision correction, such ...
The federal debt at the end of the 2018/19 fiscal year (ended September 30, 2019) was $22.7 trillion (~$27.1 trillion in 2023). The portion that is held by the public was $16.8 trillion. Neither figure includes approximately $2.5 trillion owed to the government. [ 83] Interest on the debt was $404 billion.
The discount, or charge, is the difference between the original amount owed in the present and the amount that has to be paid in the future to settle the debt. [1] The discount is usually associated with a discount rate, which is also called the discount yield. [1] [2] [4] The discount yield is the proportional share of the initial amount owed ...
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