A form of shearing interferometer that contains a simple wedged (plane-parallel) glass plate with a nonzero optical path difference to create interference between split optical wavefronts. The interferometer must be used with nearly monochromatic...

A wedge-shaped piece of quartz typically found in a polarimeter to monitor and rotate the plane of polarization of plane...

A prism formed by dividing a Nicol prism in a plane parallel to the path of vibration of the transmitted light and taking...

A subtractive colorimeter that expresses a liquid's or object's color as a combination of three colors. These colors are...

An optical filter so constructed that the density increases progressively from one end to the other, or angularly around a...

An optical wedge of very small angles that admits light while sealing out moisture and dirt and that may be rotated to...

A strip or annulus of glass coated with a semitransparent material such as inconel. The coating thickness, and as a result...

A Risley prism, also known as a Risley prism pair or Risley rotating prism, is an optical device used for controlling the...

Chirality is a property of certain molecules and objects in which they are non-superimposable on their mirror images. In...

A doped or absorbing transparent medium cut or molded into a wedge in order to measure the real and imaginary components of...

An optical wedge in which transmittance or density is a function of the location of the wedge, relative to a specific...

A spectrograph in which the flux density transmitted through the entrance aperture is regulated by an optical wedge or...

In rangefinders and height finders, a rotatable or sliding wedge-shaped element used to divert the line of sight precisely...

A photometer that uses a wedge, marked to show its reduction of flux density, to make two light sources equal in intensity...

In an optical rangefinder, the system of wedges that rotate in opposite directions to aid in the detection of deviation in...

An optical element having plane-inclined surfaces. Usually the faces are inclined toward one another at very small angles....

A circular optical wedge (prism of small refracting angle) mounted to be rotated in the path of light rays to divert the...

Geometrical partition possible with a sphere that can be four, six, eight, 12 or 20 solid-angle wedges. Each platonic mass...

A neutral-colored gelatin wedge, cast between glass plates, that is used as an intensity scale in certain types of...

A diffraction pattern sampling unit composed of a 32-element monolithic silicon photodiode array and a readout unit. The...

The maximum variation in thickness of a lens as measured around a diameter centered on the optical axis. The ETD divided by...

A device containing two opposed quartz wedges of equal angle, one wedge being movable along its length by a micrometer...

A prism produced by severing a Nicol prism and reconstructing the polarization angles of the two halves so that they are...

A method of specifying the allowable edge-thickness difference or decentering of a lens.

A wedge in a rangefinder or heightfinder used to displace the image produced by one telescope so that it coincides with that...