separated doublet
11microscope — /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… …
12Electron — For other uses, see Electron (disambiguation). Electron Experiments with a Crookes tube first demonstrated the particle nature of electrons. In this illustration, the profile of the cross shaped target is projected against the tube face at right… …
13Lens (optics) — For other uses, see Lens. A lens. Lenses can be used to focus light. A lens is an optical device with perfect or approximate axial symmetry which tra …
14Black tie — This article is about the dress code. For the country rock band, see Black Tie (band). Western dress codes Formal wear Formal Semi formal (including black tie) Informal Smart casual Business casual Casual Active attire …
15T-shirt — For the Shontelle song, see T Shirt (song). A man wearing a T shirt …
16Tessar — Infobox lens design scheme = Zeiss Tessar.svg year = 1902 author = Paul Rudolph elements = 4 groups = 3 aperture = f/6.3 (1902) f/4.5 (1917) f/2.8 (1930)The Tessar is a famous photographic lens design conceived by physicist Paul Rudolph in 1902… …
17Samoan Islands — For other uses, see Samoa (disambiguation). Samoan Islands Olosega island in the Manu a group, eastern Samoa Islands …
18Hose (clothing) — For contemporary styles see Pantyhose, Hosiery Florentine particolored hose, c. 1470 Hose are any of various styles of men s clothing for the legs and lower body, worn from the Middle Ages through the 17th century, when the term fell out of use… …
19Mary Rose — For later ships with the same name, see HMS Mary Rose. For the play by J.M. Barrie, see Mary Rose (play). The remnants of the Mary Rose undergoing conservation in Portsmouth …
20Loudspeaker — For other uses, see Loudspeaker (disambiguation). An inexpensive, low fidelity 3½ inch speaker, typically found in small radios …
