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  2. Three-mirror anastigmat - Wikipedia

    en.wikipedia.org/wiki/Three-mirror_anastigmat

    A three-mirror anastigmat is an anastigmat telescope built with three curved mirrors, enabling it to minimize all three main optical aberrations – spherical aberration, coma, and astigmatism. This is primarily used to enable wide fields of view, much larger than possible with telescopes with just one or two curved surfaces.

  3. Mirror - Wikipedia

    en.wikipedia.org/wiki/Mirror

    A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...

  4. Magnifying glass - Wikipedia

    en.wikipedia.org/wiki/Magnifying_glass

    A magnifying glass is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle. A magnifying glass can be used to focus light, such as to concentrate the Sun's radiation to create a hot spot at the focus for fire starting. A plastic Fresnel lens sold as a TV-screen magnifier

  5. Metal Section Frame - Wikipedia

    en.wikipedia.org/wiki/Metal_Section_Frame

    The metal section frame was invented by picture framer Donald P. Herbert (1926–1982) in the late 1960s. The frame was designed to fill a void within the framing industry. The concept followed Herbert's attendance at a museum conference in 1967 in Toronto where he met with Dr. Harold Joachim (1909–1983), at that time the Curator of the ...

  6. Cathode-ray tube - Wikipedia

    en.wikipedia.org/wiki/Cathode-ray_tube

    Phosphor layer on the inner side of the screen; emits light when struck by the electron beam; Filament for heating the cathode; Graphite layer on the inner side of the tube; Rubber or silicone gasket where the anode voltage wire enters the tube (anode cup) Cathode; Air-tight glass body of the tube; Screen; Coils in yoke

  7. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    Beverly White (1928–2021) was an American politician of the Democratic Party who served in the Utah House of Representatives from 1971 to 1991. Born in Salt Lake City, she was raised in Tooele after the death of her mother and graduated from Tooele High School.

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