achromatic
101Timeline of telescope technology — Timeline of telescope technology* c.2560 BC c.860 BC Egyptian artisans polish rock crystal, semi precious stones, and latterly glass to produce facsimile eyes for statuary and mummy cases. The intent appears to be to produce an optical illusion.… …
102crown lens — noun a lens made of optical crown glass • Hypernyms: ↑lens, ↑lense, ↑lens system * * * noun : the crown glass component of an achromatic lens * * * Optics. a lens made of crown glass, usually used as the converging lens component of an achromatic …
103Cooke triplet — Introduced in: 1893 Author: Dennis Taylor Construction: 3 elements in 3 groups Aperture: f/3.5 (early) …
104Peter Dollond — Infobox Scientist name = Peter Dollond box width = image width = 200px caption = birth date = February 24, 1731 birth place = Kensington, England death date = July 2, 1821 death place = residence = citizenship = nationality = ethnicity = field =… …
105Crown glass (optics) — This article is about crown glass as used in optics. For the window glass, see Crown glass (window). Crown glass is type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low… …
106Chester Moore Hall — (9 December 1703, Leigh, Essex, England – 17 March 1771, Sutton, Surrey) was a British lawyer and inventor who produced the first achromatic lenses in 1729 or 1733 (accounts differ). He used the achromatic lens to build the first refracting… …
107Christine Ladd-Franklin — Born D …
108Discovery of Neptune — New Berlin Observatory at Linden Street, where Neptune was discovered observationally. Neptune was mathematically predicted before it was directly observed. With a prediction by Urbain Le Verrier, telescopic observations confirming the existence… …
109microscope — /muy kreuh skohp /, n. 1. an optical instrument having a magnifying lens or a combination of lenses for inspecting objects too small to be seen or too small to be seen distinctly and in detail by the unaided eye. 2. (cap.) Astron. the… …
110Hall, Chester Moor — ▪ British jurist and mathematician born Dec. 9, 1703, Leigh, Essex, Eng. died March 17, 1771, Sutton, Surrey English jurist and mathematician who invented the achromatic lens, which he utilized in building the first refracting telescope… …
