elliptical reflector

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• Cassegrain reflector — The Cassegrain reflector is a combination of two coaxial reflectors used in Cassegrain telescopes and radio antennas.First developed in 1672 by Laurent Cassegrain, this reflector is a combination of a primary concave mirror and a secondary convex …   Wikipedia

• Xenon arc lamp — A xenon arc lamp is an artificial light source. Powered by electricity, it uses ionized xenon gas to produce a bright white light that closely mimics natural daylight.Xenon arc lamps can be roughly divided into three categories: * Continuous… …   Wikipedia

• Incandescent light bulb — The incandescent light bulb, incandescent lamp or incandescent light globe is a source of electric light that works by incandescence, (a general term for heat driven light emissions which includes the simple case of black body radiation). An… …   Wikipedia

• Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia

• MIM-23 Hawk — PAR Pulse Acquisition Radar The pulse acquisition radar is a long range, high altitude search radar.* AN/MPQ 35 (Basic Hawk)The search radar used with the basic HAWK system, with a radar pulse power of 450 kW and a pulse length of 3 µs, a Pulse… …   Wikipedia

• Etendue — or étendue is a property of an optical system, which characterizes how spread out the light is in area and angle. The étendue can be defined in several equivalent ways. From the source point of view, it is the area of the source times the solid… …   Wikipedia

• SuperDish — The SuperDISH was deployed by DISH Network in November 2003 as a means to provide more channels for subscribing customers. Its elliptical reflector is 36 x 20 more than 50% larger than the round 20 DISH 500. The SuperDISH receives signals from… …   Wikipedia

• North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… …   Wikipedia

• Multiangle light scattering — (MALS) is a technique for determining, independently, the absolute molar mass and the average size of particles in solution, by detecting how they scatter light. Collimated light from a laser source is most often used, in which case the technique …   Wikipedia

• Reflecting telescope — 24 inch convertible Newtonian/Cassegrain reflecting telescope on display at the Franklin Institute. A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light… …   Wikipedia

• Parabola — For other uses, see Parabola (disambiguation). A parabola …   Wikipedia