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concave Dictionary Terms

meniscus lens
A lens that has one convex surface and the other concave.
Rowland circle
The circle that contains the slit, grating and primary astigmatic focus of a concave diffraction grating.
Ritchey-Chretien telescope
A form of Cassegrain telescope having a concave hyperbolic primary and a convex hyperbolic secondary. This form permits the...
concave grating
A reflecting grating ruled on a concave spherical surface that not only disperses the light but focuses the spectrum. The...
planoconcave lens
A lens with one plane surface and one concave surface.
concave holographic grating
The generation of a grating on a concave spherical blank by the holographic process. In this way, ghost images and intense...
Wadsworth mounting
A system used for gratings that consists of a concave mirror, a grating and a plate holder mounted normal to the grating to...
galvanometer mirror
A small mirror, sometimes plane and sometimes concave, attached to the rotating coil of a galvanometer to cause a spot of...
reflection grating
A reflection grating is an optical component that consists of a series of closely spaced, parallel reflecting surfaces or...
center of curvature
The center of the sphere of which the surface of a lens or mirror forms a portion. Each curved surface of a lens has a...
optical cement
A permanent, transparent, and highly transmissive adhesive capable of withstanding extreme temperatures that is applied to...
biconcave lens
A lens having each of its outer faces curved inward.
diverging lens
A diverging lens is a type of lens that causes parallel rays of light to spread out or diverge. It is thinner in the center...
concave
Concave is an adjective used to describe a surface or shape that curves inward or has a hollow or recessed appearance. In...
radius tool
A metal device of convex or concave curvature to which lens castings or semifinished lenses are cemented with only their...
lap
A metal tool used to grind lenses with loose abrasive (see diamond cutting tool). The functional surface of the lap is...
cylindrical lens
A cylindrical lens is an optical component that has different curvatures along its two orthogonal axes, resulting in a shape...
shallow
A term used to denote a concave surface having too long a radius of curvature. That is, its negative power is too small or...
Ronchi grating
A transparent plate ruled with black lines and equal, clear spaces. It is used as a multiple knife-edge for testing a...
Rowland mounting
The mounting of a concave diffraction grating and a plate holder at the ends of a rigid bar. The ends follow separate...
spectrograph
An optical instrument for forming the spectrum of a light source and recording it on a film. The dispersing medium may be a...
laser optics
Laser optics refers to a broad category of optical components and systems designed for manipulating and controlling laser...
focal length
The focal length of a lens is the distance between the lens's optical center (or principal point) and the image sensor or...
reflecting spectrograph
A solar spectrograph that uses long focus concave mirrors as its collimator and camera element.
spheric lens
A spheric lens, also known as a spherical lens, is a type of optical lens with at least one surface that is part of a...
hemispherical cavity
Laser cavity bounded by a plane mirror and a concave spherical mirror with the plane mirror located at the center of...
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...
dual laser
A gas laser equipped with Brewster windows and concave mirrors (having unlike reflective properties) at each end of the tube...
Gregorian telescope
A telescope with an ellipsoidal secondary concave mirror that reflects rays from a parabolic primary mirror through an...
convex
Convex is an adjective used to describe a surface or shape that curves outward, bulges, or has a rounded and outwardly...
concave lens
ophthalmoscope
Also referred to as a funduscope, an ophthalmoscope is a specialized instrument used by ophthalmologists for observing and...
telescope lens
A telescope lens is a primary optical component of a telescope system that gathers and focuses light to form an image. It is...
lamp housing
A device designed to concentrate and direct a light source by enclosing the source in it and using a concave reflector to...
convexo-concave lens
deep
A concave surface that has too much negative power; i.e., its radius of curvature is too short. This condition can be...
Schmidt camera
A camera that consists of a concave spherical mirror with an aspheric plate situated at the center of curvature of the...
divergent-meniscus lens
A lens with one surface convex and the other concave, the latter having the greater curvature. It also is known as a...
paraboloidal mirror
A concave mirror that has the form of a paraboloid of revolution. The paraboloidal mirror may have only a portion of a...
Hindle sphere
A null optic in the form of a concave spherical mirror; used for the test and evaluation of a hyperboloidal aspheric surface.
lens
A lens is a transparent optical device that focuses or diverges light, allowing it to pass through and form an image. Lenses...
Czerny-Turner design
A form of monochromator optical system consisting of two spherical concave mirrors used in conjunction with a movable...
concavo-convex lens
A lens with one concave surface and one convex surface; synonymous with meniscus.
blocking shaper
A convex, concave or flat cast iron form that is used to shape a soft mold block of optical components.
Paschen-Runge mounting
A mounting used for large concave gratings, whereby the slit, grating and plate holder lie in the Rowland circle, and the...
saddle
A term used to describe a saddle-shaped -- i.e., convex along one axis, concave along the other -- polished surface,...
double-concave lens
A diverging lens with both surfaces concave.
negative meniscus lens
A negative powered lens with one surface convex and the other concave, the latter having the greater curvature. It also is...
Mangin mirror
A double-surfaced catadioptric spherical mirror whose spherical first surface consists of a negative meniscus (concave) lens...
concave and convex spherical mirror
Concave and convex spherical mirrors are types of curved mirrors that have surfaces shaped like segments of spheres. These...
first-side meniscus
The process of grinding the concave surface of a single-vision spherical lens.
curvilinear distortion
A lens aberration in which the focal length varies radially outward from the center of the field. It has the effect of...
second-side toric
The process of grinding the concave surface of a sphero-cylindrical lens.
converging meniscus
A converging lens with one convex and one concave surface.
second-side meniscus
The process of grinding the convex surface of a convexo-concave meniscus.
countersink
The concave portion of a surface, formed on a blank, on which the disk of higher refractive glass will be fused to form a...
confocal spherical interferometer
An interferometer formed by two similar concave spherical mirrors arranged with the center of one sphere on the other...
plane grating
A transmission or reflecting grating with a flat or plane surface requiring a lens or concave mirror to focus the spectrum.
Newtonian telescope
A telescope with a concave paraboloidal objective mirror and a small plane (diagonal) mirror that reflects rays from the...

(59 results found)

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