focal centre length
61sound — sound1 soundable, adj. /sownd/, n. 1. the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium. 2. mechanical vibrations transmitted through an elastic medium, traveling in air at a… …
62Sound — /sownd/, n. The, a strait between SW Sweden and Zealand, connecting the Kattegat and the Baltic. 87 mi. (140 km) long; 3 30 mi. (5 48 km) wide. Swedish and Danish, Oresund. * * * I Mechanical disturbance that propagates as a longitudinal wave… …
63Kunming — 昆明   Prefecture level city   昆明市 Clockwise from top: Kunming s Skyli …
64Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …
65Singapore Omni-Theatre — The Singapore Omni Theatre is an observatory and IMAX film theatre located in the Science Centre, Singapore in the city state Singapore, South east Asia. It opened in 1977. The Science Centre house more than 850 exhibits, mostly interactive; the… …
66Mills Observatory — Location …
67Italy — /it l ee/, n. a republic in S Europe, comprising a peninsula S of the Alps, and Sicily, Sardinia, Elba, and other smaller islands: a kingdom 1870 1946. 57,534,088; 116,294 sq. mi. (301,200 sq. km). Cap.: Rome. Italian, Italia. * * * Italy… …
68Florence — Firenze and Florentine redirect here. For other uses, see Florentin, Florentine (disambiguation), Florence (disambiguation) or Firenze (disambiguation). Florence Firenze   Comune   …
69Dublin City University — Ollscoil Chathair Bhaile Átha Cliath Latin: Universitas Urbis Dubliniae Established 1975 (University status from 1989) …
70Telecentric lens — A telecentric lens is a compound lens which has its entrance or exit pupil at infinity; in the prior case, this produces an orthographic view of the subject. This means that the chief rays (oblique rays which pass through the center of the… …
