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Alluxa - Optical Coatings LB 8/23
Vertex Dictionary Terms

eye relief
Also termed eye distance. The distance between the vertex of the last optical surface of a visual optical system and the...
front operating aperture
The restricting aperture located at the front of the lens. It is usually defined as the maximum diameter of the entrance...
radiation angle
Half the vertex angle of the cone of light emitted by a fiber.
geometric center
The physical center of the lens; it is on the axis of the lens, halfway between the front and rear vertex. It is sometimes...
beamwidth
The angular width of a radiation beam. With respect to a conical beam of light, it is the vertex angle of the cone. The...
Cassegrain lens system
A two-mirror lens design used in astronomical telescopes, the primary being a parabola, the secondary a smaller hyperbola....
sharp height
The distance between the base and the vertex before the edging of a prism.
vertex
The point of intersection of the optical axis with any centered optical surface.
image working distance
The distance between the last vertex of a lens and the image.
lensometer
An ophthalmic instrument used to measure the magnitude and direction of the maximum and minimum powers of a spectacle lens,...
object working distance
Distance between the front vertex of a lens and the object.
circular scanning
Scanning characterized by the generation of a plane or right circular cone with a vertex angle of about 180° by the...
refracted ray method
The technique for measuring the index profile of an optical fiber by scanning the entrance face with the vertex of a high...
platonic solid
Geometrical partition possible with a sphere that can be four, six, eight, 12 or 20 solid-angle wedges. Each platonic mass...
vertex power
The reciprocal of the back focal distance of a spectacle lens.
vertometer
A device that measures the back focal length or vertex power of a lens.
dip
The departure of a curved surface from the plane that is tangent to its vertex. See sag.
front vertex focal distance
The distance between the front focal point and the vertex of the front surface.
sagged bevel
The shape of the edge of a concave surface when the depth of the bevel plane to the vertex of the surface is controlled to a...
numerical aperture
The sine of the vertex angle of the largest cone of meridional rays that can enter or leave an optical system or element,...

(20 results found)

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