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interferometer

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interferometer
1. Instrument designed to measure the wavelength of light, the refractive index of a medium, as well as the flatness, thickness, the quality of optical surfaces, etc. The interferometer is based on the phenomenon of interference between two coherent beams of light. 2. Name given to several types of clinical maxwellian view system used to measure visual acuity. See clinical maxwellian view system.


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It is the first time the Keck Interferometer Nuller instrument has identified such a compact cloud around a star so far away.
The findings were presented Tuesday at a meeting of the American Astronomical Society in Pasadena, California, and were based on readings collected at UC Berkeley's Infrared Spatial Interferometer (ISI) atop Mount Wilson in Southern California.
Using this "very long baseline interferometer," the team examined Sagittarius A* in unprecedented detail, resolving for the first time features about as small as the black hole's event horizon--the surface from beneath which nothing can escape.
 
 
 
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