Refracting
121Galilean telescope — a refracting telescope that forms an erect image, consisting of an objective of relatively long focal length that causes light rays to converge and an eyepiece of short focal length that causes them to diverge. [1715 25] * * * instrument… …
122microscope — /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… …
123prism — /priz euhm/, n. 1. Optics. a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light. 2. Geom. a solid having bases or ends that are parallel, congruent polygons and sides… …
124stained glass — stained glass, adj. glass that has been colored, enameled, painted, or stained, esp. by having pigments baked onto its surface or by having various metallic oxides fused into it, as used in church windows, decorative lampshades, etc. [1785 95] *… …
125Yerkes Observatory — an astronomical observatory located in Williams Bay, Wisconsin, affiliated with the University of Chicago, and having a 40 in. (102 cm) refracting telescope, the largest refractor in the world. * * * ▪ observatory, Williams Bay, Wisconsin, United …
126Gullstrand, Allvar — born June 5, 1862, Landskrona, Swed. died July 28, 1930, Stockholm Swedish ophthalmologist. He contributed to knowledge of the cornea and of astigmatism, improved post cataract surgery corrective lenses, and devised the Gullstrand slit lamp, a… …
127TEBBUTT, John (1834-1916) — astronomer was born at Windsor, New South Wales, on 25 May 1834, the only son of John Tebbutt, then a prosperous store keeper. His grandfather, John Tebbutt, was one of the early free settlers in Australia; he arrived at Sydney about the end of… …
128Lens — The transparent structure inside the eye that focuses light rays onto the retina (the nerve layer that lines the back of the eye, senses light and creates impulses that go through the optic nerve to the brain). The lens was named after the lentil …
