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The prismatic lenses of the belay glasses are arranged so as to bend light from above through total internal reflection into the observer's eye, allowing the belayer to observe the climber while maintaining a comfortable head/neck position. The design based on the eyeglasses frame provides for a split field of vision:
Here are the 10 most expensive sunglasses in the world and what they cost. ... For $200,000 you can see the world through these green-colored glasses. 2. Dolce & Gabbana DG2027B — $383,609.
Some prisms were made with multiple pendant prisms, either as a Fresnel-lens-like sheet of identical prisms ("multi") or a sheet of dissimilar prisms that could distribute the light ("three-way" etc.). [33] The precise angles at which the prisms refracted or reflected light was important.
Some of these glasses (e.g. Germanium dioxide (GeO 2, Germania), in many respects a structural analogue of silica, fluoride, aluminate, phosphate, borate, and chalcogenide glasses) have physicochemical properties useful for their application in fibre-optic waveguides in communication networks and other specialised technological applications.
So-called "low-Tg-glasses" with a maximum transition temperature of less than 550 °C have been developed in order to enable new manufacturing routes for the moulds. Mould materials such as steel can be used for moulding low-Tg-glasses whereas high-Tg–glasses require a high-temperature mould material, such as tungsten carbide.
Roman Kim was born in the Kazakh Soviet Socialist Republic two months before the dissolution of the Soviet Union to a family with Tatar, Belarusian and Korean origins.At the age of five he received his first violin and at the age of seven he won first prizes in national competitions.
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