Dictionary search results

Showing 1-50 of 59 results

optical US English

Of or relating to sight, especially in relation to the physical action of light

optical art US English

Another term for op art.

optical axis US English

A line passing through the center of curvature of a lens or spherical mirror and parallel to the axis of symmetry

optical bench US English

A straight rigid bar, typically marked with a scale, to which lenses, light sources, and other optical components can be attached

optical disc US English

A disc (such as a CD-ROM) on which data is stored or recorded using light, providing increased durability and capacity compared with a magnetic disk.

optical drive US English

A disk drive that uses optical rather than magnetic methods to read and write data.

optical fiber US English

A thin flexible fiber with a glass core through which light signals can be sent with very little loss of strength

optical flat US English

A block or lamina (usually of glass) with one or more surfaces made accurately plane and smooth, any unevenness or departure from a perfect plane being small compared with the wavelength of light.

optical glass US English

A very pure kind of glass used for lenses

optical model US English

A model of the atomic nucleus in which it is treated as having a potential well with an additional negative imaginary component, so that its behaviour with respect to incident particles is somewhat analogous to that of a partially absorbing body with respect to incident light waves.

optical mouse US English

A mouse which uses light sensors rather than motion to track its position.

optical path US English

The distance of the path that in a vacuum would contain the same number of wavelengths as the actual path taken by a ray of light traveling through a medium

optical sound US English

Recorded sound represented by a pattern of light and dark alongside the frames of a film.

optical trap US English

A device for trapping any stray or unwanted light in a piece of equipment.

piezo-optical US English

= photoelastic.

quasi-optical US English

Analogous to or resembling something optical; especially of or relating to electromagnetic waves with frequencies near those of visible light.

acousto-optical US English

Relating to or involving the interaction of sound and light, especially the modulation or diffraction of laser beams by sound waves.

magneto-optical US English

Of, relating to, or employing both optical and magnetic phenomena or technology

optical cavity US English

A volume delimited with reflective boundaries within which electromagnetic radiation undergoes repeated internal reflection; especially one designed to give constructive interference for a particular frequency of radiation, as in a laser.

optical centre US English

The point on the optical axis of a lens where all rays passing through it remain unrefracted.

optical dating US English

A technique for determining the time since a mineral sediment was last exposed to sunlight, in which electrons trapped at light-sensitive locations within the mineral are excited using an intense light source, and the resulting luminescence is measured.

optical density US English

The degree to which a refractive medium retards transmitted rays of light

optical double US English

Two stars that are in the same line of sight as seen from the earth, but that may be at far different distances

optical isomer US English

Each of two or more forms of a compound that have the same structure but are mirror images of each other and typically differ in optical activity

optical lattice US English

A periodic array of potential wells created by the interference of laser beams.

optical length US English

The distance which in a vacuum would contain the same number of wavelengths as the actual path followed by a ray of light, equal to the product of the actual path-length and the refractive index of the medium if the latter is homogeneous.

optical printer US English

A printer in which film frames are projected one at a time through an optical system and photographed, used chiefly for producing special effects.

optical pumping US English

The production of an inversion in the population of certain energy levels in the atoms of a gas by the absorption of optical (visible) resonance radiation of suitable polarization.

optical scanner US English

A device that performs optical character recognition and produces coded signals corresponding to the characters identified

optical square US English

An instrument used to establish lines of sight at right angles to each other by using light bent through a right angle by mirrors or a prism.

optical switch US English

A device that can be made to deflect, interrupt, or modify an incident beam of light when required, as by varying the optical transmission properties of a material by means of an applied electric or magnetic field.

psycho-optical US English

Designating or involving involuntary eye movements occurring during visual activity.

electron-optical US English

Of or relating to electron optics; employing or involving electron optics.

optical activity US English

The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light

optical amplifier US English

A device that amplifies an optical beam or signal; especially one that amplifies an optical signal without converting it to an electronic signal at any stage.

optical brightener US English

A fluorescent substance added to detergents in order to produce a whitening effect on laundry

optical comparator US English

Any of various instruments for facilitating the visual comparison of two objects or images; especially one that projects shadows or transparencies of them on to a screen.

optical illusion US English

An experience of seeming to see something that does not exist or that is other than it appears

optical microscope US English

A microscope using visible light, typically viewed directly by the eye

optical molasses US English

A field of strong laser light that exerts a damping force on the motion of free atoms in it, thereby cooling them to a very low temperature.

optical pyrometer US English

A device for measuring the temperature of an incandescent body by comparing its brightness with that of a heated filament in the instrument.

optical rotation US English

The rotation of the plane of polarization of plane-polarized light by an optically active substance

optical scanning US English

Scanning in which the light reflected or transmitted by the area scanned is detected, especially as used in optical character recognition.

optical transistor US English

Any of various optical devices whose function can be considered analogous to that of a transistor; especially one that modulates the amplitude of a light beam in response to the variation of a second (weaker) input light signal.

optical turnstile US English

An access control system without barriers in which those attempting to enter are evaluated by closed-circuit television or other visual means

optical tweezers US English

A device that uses light from a low-wattage laser to manipulate individual molecules within cells

optical bistability US English

The property an optical device or medium of exhibiting two different stable states, characterized by high and low optical transmissivity respectively, for a particular range of incident light intensities.

optical character reader US English

A device used for optical character recognition.

optical character recognition US English

The identification of printed characters using photoelectric devices and computer software

optical rotatory dispersion US English

The variation of the optical activity of a substance with the wavelength of the light concerned.

Page: 1 2