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The point where the isogyres is most tightly curved represents the position of each of the two optic axes present for a biaxial mineral, and thus the maximum separation between the two curves is diagnostic of the angle between the two optic axes for the mineral. This angle is called the optic angle and often notated as "2V". In some cases ...
The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...
2V or 2-V may refer to: 2V, IATA code for Amtrak; 2V angle, curved isogyre differences in a conoscopic interference pattern in optical crystallography; P-2V, a model of Lockheed P-2 Neptune; An-2V, a model of Antonov An-2; 2V (V-69), manufacturer's designation for Venera 5 spacecraft; 2VLY, call sign for Power FM 98.1
The position of the lenses A and B are known, and the angle of the lenses α and/or β is set by the operator so that both are aimed at the target. Because the distance between A and B on a coincidence rangefinder is typically fixed, once the angle is set correctly the operator need only read the range from the scale.
Future Imagery Architecture (FIA) was a program awarded to Boeing to design a new generation of optical and radar imaging US reconnaissance satellites for the National Reconnaissance Office (NRO). In 2005 NRO director Donald Kerr recommended the project's termination, and the optical component of the program was finally cancelled in September ...
Luminance meter for measuring luminance, i.e. luminous flux per unit area and unit solid angle; Light meter, an instrument used to set photographic exposures. It can be either a lux meter (incident-light meter) or a luminance meter (reflected-light meter), and is calibrated in photographic units.
Visulization of flux through differential area and solid angle. As always n ^ {\displaystyle \mathbf {\hat {n}} \,\!} is the unit normal to the incident surface A, d A = n ^ d A {\displaystyle \mathrm {d} \mathbf {A} =\mathbf {\hat {n}} \mathrm {d} A\,\!} , and e ^ ∠ {\displaystyle \mathbf {\hat {e}} _{\angle }\,\!} is a unit vector in the ...
-do-; has a catch (lock) and is used for heavier gauge needles (thicker than 6–0); used mainly for skin, muscle and corneal incisions •Barraquer's needle holder-do-; small instrument with a spring action with or without a catch used for finer gauge needles (5-0 or finer); used mainly for intraoccular incisions Forceps: to hold anything
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