Relating to sight, especially in relation to the action of light
Another term for op art.
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.
A disk drive that uses optical rather than magnetic methods to read and write data.
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.
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.
A mouse which uses light sensors rather than motion to track its position.
Recorded sound represented by a pattern of light and dark alongside the frames of a film.
A device for trapping any stray or unwanted light in a piece of equipment.
Analogous to or resembling something optical; especially of or relating to electromagnetic waves with frequencies near those of visible light.
A line passing through the centre of curvature of a lens or spherical mirror and parallel to the axis of symmetry
A straight rigid bar, typically marked with a scale, to which supports for lenses, light sources, and other optical components can be attached
A thin flexible fibre with a glass core through which light signals can be sent with very little loss of strength
A very pure kind of glass used for lenses
The distance which in a vacuum would contain the same number of wavelengths as the actual path taken by a ray of light
Relating to or involving the interaction of sound and light, especially the modulation or diffraction of laser beams by sound waves.
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.
The point on the optical axis of a lens where all rays passing through it remain unrefracted.
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.
A periodic array of potential wells created by the interference of laser beams.
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.
A printer in which film frames are projected one at a time through an optical system and photographed, used chiefly for producing special effects.
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.
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.
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.
Designating or involving involuntary eye movements occurring during visual activity.
Relating to or employing both optical and magnetic phenomena or technology
The degree to which a refractive medium retards transmitted rays of light
A group of two stars which appear to constitute a double star due to their being in the same line of sight as seen from the earth, but are actually at different distances
Each of two or more forms of a compound which have the same structure but are mirror images of each other and typically differ in optical activity
A device which performs optical character recognition and produces coded signals corresponding to the characters identified
Of or relating to electron optics; employing or involving electron optics.
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.
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.
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.
A device for measuring the temperature of an incandescent body by comparing its brightness with that of a heated filament in the instrument.
Scanning in which the light reflected or transmitted by the area scanned is detected, especially as used in optical character recognition.
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.
An access control system without barriers in which those attempting to enter are evaluated by closed-circuit television or other visual means
A device that uses light from a low-wattage laser to manipulate individual molecules within cells
The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light
A fluorescent substance added to detergents in order to produce a whitening effect on laundry
Something that deceives the eye by appearing to be other than it is
A microscope using visible light, typically viewed directly by the eye
The rotation of the plane of polarization of plane-polarized light by an optically active substance
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.
A device used for optical character recognition.
The variation of the optical activity of a substance with the wavelength of the light concerned.
The identification of printed characters using photoelectric devices and computer software