high-performance mirror
31microscope — /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… …
32Dinghy sailing — A Contender dinghy on a broad reach. Dinghy sailing is the activity of sailing small boats by using five essential controls: the sails the foils (i.e. the daggerboard or centreboard and rudder and sometimes lifting foils as found on the Moth).… …
33Laser diode — Top: a packaged laser diode shown with a penny for scale. Bottom: the laser diode chip is removed from the above package and placed on the eye of a needle for scale …
34Solar thermal energy — Solar thermal system for water heating in Santorini, Greece …
35education — /ej oo kay sheuhn/, n. 1. the act or process of imparting or acquiring general knowledge, developing the powers of reasoning and judgment, and generally of preparing oneself or others intellectually for mature life. 2. the act or process of… …
36Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… …
37Solar sail — Solar sails (also called light sails or photon sails, especially when they use light sources other than the Sun) are a proposed form of spacecraft propulsion using large membrane mirrors. Radiation pressure is about 10 5 Pa at Earth s distance… …
38List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
39Pentax cameras — This article discusses the cameras – mainly 35 mm SLRs – manufactured by Hoya Corporation s Pentax division (ペンタックス, Pentakkusu?) and its predecessors, Pentax Corporation (ペンタックス株式会社, Pentakkusu Kabushiki gaisha …
40Amateur telescope making — The field of amateur telescope making is considered an offshoot of the amateur astronomy community. Amateur telescope makers (sometimes called ATMs), as their name implies, are not paid professionals. They build their telescopes for the enjoyment …
