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The optical square uses a pentaprism to reflect and refract a beam or sighting 90 degrees, it is used in pairs in surveying and in a singular block in
Optical_square
Measurement tool
frequently eight-sided rather than round. Optical square - an improved version of the cross-head, the optical square used two silvered mirrors at 45° to each
Jacob's_staff
Device to reflect radiation back to its source
reflector Free-space optical communication GPS Block III satellite improvements Heiligenschein High-visibility clothing Optical square Opposition surge Modulating
Retroreflector
Light-conducting fiber
An optical fiber, or optical fibre, is a flexible glass or plastic fiber that can transmit light from one end to the other. Such fibers are widely used
Optical_fiber
Optical illusion
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them
Missing_square_puzzle
Standardized optical fiber digital audio interconnect
Link) is a standardized optical fiber connector system. Generically known as optical audio, the most common use of the TOSLINK optical fiber connector is in
TOSLINK
Device that emits light via optical amplification
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word
Laser
Characteristic of an optical system
The optical transfer function (OTF) of an optical system such as a camera, microscope, human eye, or projector is a scale-dependent description of their
Optical_transfer_function
Arrangement of mirrors
An optical cavity, resonating cavity or optical resonator is an arrangement of mirrors or other optical elements that confines light waves similarly to
Optical_cavity
Scientific instruments
Optical tweezers (originally called single-beam gradient force trap) are scientific instruments that use a highly focused laser beam to hold and move
Optical_tweezers
related to Optical illusion. Optical Illusion Examples by Great Optical Illusions Optical Illusions & Visual Phenomena by Michael Bach Optical Illusions
List_of_optical_illusions
Type of two-dimensional barcode
vertical components of the QR image. Whereas a barcode is a machine-readable optical image that contains information specific to the labeled item, the QR code
QR_code
Visually perceived images that differ from objective reality
In visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept
Optical_illusion
American online retailer of prescription glasses and sunglasses
Zenni Optical (formerly 19dollareyeglasses.com) is an American online retailer of prescription glasses and sunglasses. Founded in 2003 by Tibor Laczay
Zenni_Optical
Chinese scientist and revolutionary (born 1961)
1961) is a Chinese-born American aerospace engineer, computer scientist, optical physicist, political activist, and writer. He founded the Beijing Students'
Liu_Gang
Japanese entertainment company
Square Enix Holdings Co., Ltd. is a Japanese multinational holding company, video game publisher and entertainment conglomerate. It releases role-playing
Square_Enix
Canadian optician and eyewear retail chain
Hakim Optical Lab Ltd. is a Canadian optical chain, the largest privately owned optical chain in Canada. In 2016, it had about 160 stores. Karim Hakimi
Hakim_Optical
Branch of physics that studies light
the principles of pinhole cameras, inverse-square law governing the intensity of light, and the optical explanations of astronomical phenomena such as
Optics
Device that amplifies an optical signal
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier
Optical_amplifier
Distortion of the perception of reality
Illusions may occur with any of the human senses, but visual illusions (optical illusions) are the best-known and understood. The emphasis on visual illusions
Illusion
Optical aberration
proportional to the square of the angle between the rays from the object and the optical axis of the system. With care, an optical system can be designed
Astigmatism_(optical_systems)
Optical illusion
image depicts a checkerboard with light and dark squares, partly shadowed by another object. The optical illusion is that the area labeled A appears to
Checker_shadow_illusion
Telescope in Armenia
The Orgov Radio-Optical Telescope, also known as ROT54 or the Herouni Mirror Radio Telescope, is a radio telescope in Orgov, Armenia. It was built between
Orgov_Radio-Optical_Telescope
Theorem in physics
In physics, the optical theorem is a general law of wave scattering theory, which relates the zero-angle scattering amplitude to the total cross section
Optical_theorem
Branch of material physics involving photoelectronic devices
electromagnetic (optical) and the electrical (electronic) states of materials. The electro-optic effect is a change in the optical properties of an optically active
Electro-optics
Autocorrelation functions realized in optics
used in autocorrelation measurements, as well as higher-order nonlinear optical processes such as third-harmonic generation, in which case the mathematical
Optical_autocorrelation
Tower-based signaling network
An optical telegraph is a line of stations, typically towers, for the purpose of conveying textual information by means of visual signals (a form of optical
Optical_telegraph
Telescope for observations with visible light
An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual
Optical_telescope
Shape with four equal sides and angles
generalized symbols in Latin square, and with color or blank in nonogram, as well as paradoxical optical illusions such as the missing square puzzle and the chessboard
Square
Device that detects smoke, typically as an indicator of fire
millimetres (1 in) thick, but shape and size vary. Smoke can be detected either optically (photoelectric) or by physical process (ionization). Detectors may use
Smoke_detector
Optical component allowing the transmission of light in only one direction
An optical isolator, or optical diode, is an optical component which allows the transmission of light in only one direction. It is typically used to prevent
Optical_isolator
Imaging technique
Optical coherence tomography (OCT) is a high-resolution imaging technique with most of its applications in medicine and biology. OCT uses coherent near-infrared
Optical_coherence_tomography
Use of light to convey information
Optical communication, also known as optical telecommunication, is communication at a distance using light to carry information. It can be performed visually
Optical_communication
Computer vision technique for optical flow estimation
consideration, and solves the basic optical flow equations for all the pixels in that neighbourhood, by the least squares criterion. By combining information
Lucas–Kanade_method
Case or other packaging used to protect optical discs
Optical disc packaging is the packaging that accompanies compact discs, DVDs, and other formats of optical discs. Most packaging is rigid or semi-rigid
Optical_disc_packaging
Storage technology
Optical Disc Archive (ODA) is an archival storage technology developed by Sony. A single cartridge is designed to hold as many as 12 optical discs, each
Optical_Disc_Archive
Mounting system for optics
An optical cage system is an optomechanical system that is used to mount optical elements such as lenses and mirrors together in a rigid assembly. Optical
Optical_cage_system
Natural number
displays of pocket calculators and digital watches, as well as certain optical character recognition fonts, 4 is seen with an open top: . Television stations
4
Frequency in atomic physics
transition dipole moment for the i → j {\displaystyle i\to j} transition, whose squared amplitude represents the strength of the interaction between the electromagnetic
Rabi_frequency
Optical instrument
A stanhope or stanho-scope is an optical device that enables the viewing of microphotographs without using a microscope. They were invented by René Dagron
Stanhope_(optical_bijou)
Information method in electromagnetic radiation
Optical heterodyne detection is a method of extracting information encoded as modulation of the phase, frequency or both of electromagnetic radiation
Optical_heterodyne_detection
Number used to evaluate the performance of an amplifier
measured using a coherent optical I&Q receiver. In these, power of the output signal is proportional to the square of an optical field amplitude because
Noise_figure
Japanese manufacturer of optical products
Okaya Optical Co., Ltd. (岡谷光学機械株式会社; Okaya Kōgaku Kikai Kabushiki Gaisha) was the manufacturer in the 1950s of "Lord" cameras, "Vista" binoculars, and
Okaya_Optical
Type of code
Polybius square and the Polybius cipher can be combined with other cryptographic methods such as the ADFGVX cipher, Homophonic cipher and more. Optical communication –
Polybius_square
Device used to join fiber optic strands in communication systems
An optical fiber connector is a device used to link optical fibers, facilitating the efficient transmission of light signals. An optical fiber connector
Optical_fiber_connector
Apparatus for trapping and cooling neutral atoms
In atomic, molecular, and optical physics, a magneto-optical trap (MOT) is an apparatus which uses laser cooling and a spatially varying magnetic field
Magneto-optical_trap
Ability of an imaging system to resolve detail
Optical resolution is the resolved detail of an imaging system by scale. An imaging system may have many individual components, including one or more
Optical_resolution
aperture off-axis optical system optical aberration optical amplifier optical axis optical axis gratings optical bench optical coating optical coherence tomography
Index_of_optics_articles
SI unit of frequency
of Canada: Optical frequency standard based on a single trapped ion (archived 23 December 2013) National Research Council of Canada: Optical frequency
Hertz
Microscopy technique
Near-field scanning optical microscopy (NSOM) or scanning near-field optical microscopy (SNOM) is a microscopy technique for nanostructure investigation
Near-field scanning optical microscope
Near-field_scanning_optical_microscope
Measurement method using interference of waves
technique in the fields of astronomy, fiber optics, engineering, metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications
Interferometry
Measure of the sensitivity of a photodetector
detector system, it is called the optical NEP. The optical NEP is equal to the electrical NEP divided by the optical coupling efficiency of the detector
Noise-equivalent_power
Measure of the "spread" of light in an optical system
Etendue or étendue (/ˌeɪtɒnˈduː/) is a property of light in an optical system, which characterizes how "spread out" the light is in area and angle. It
Etendue
Capturing of human-marked data from document forms
Optical mark recognition (OMR) collects data from people by identifying markings on a paper. OMR enables the hourly processing of hundreds or even thousands
Optical_mark_recognition
Response if an optical system to a point source of light
The point spread function (PSF) describes the response of a focused optical imaging system to an idealized point source of light. In casual terms, for
Point_spread_function
Form of perceptual phenomena
The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. It is a simple, wire-frame
Necker_cube
Process in microfabrication
Photolithography (also known as optical lithography) is a process that involves using light to transfer a pattern onto a photoresist layer deposited on
Photolithography
Six banner. Secret Square (7" vinyl single) (1995) Secret Square (LP) (1995) Secret Square at Elephant6.com. Optical Atlas Secret Square at AllMusic.
Secret_Square
Microscopic optical resolution test device
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951
1951 USAF resolution test chart
1951_USAF_resolution_test_chart
Accounting of signal gains and losses in communications
through a communication medium such as radio waves, cables, waveguides, or optical fibers, to the receiver. It is an equation giving the received power from
Link_budget
Art movement
art, short for optical art, is a style of visual art that uses distorted or manipulated geometrical patterns, often to create optical illusions. It began
Op_art
Process of recording the movement of objects or people
into its headquarters. Namco's 1995 arcade game Soul Edge used passive optical system markers for motion capture. Motion capture also uses athletes in
Motion_capture
Proportion of observed intensity to ideal intensity, in astronomical imaging
quality of optical image formation, originally proposed by Karl Strehl, after whom the term is named. Used variously in situations where optical resolution
Strehl_ratio
Fiber-optical thermometers can be used in electromagnetically strongly influenced environment, in microwave fields, power plants or explosion-proof areas
Fiber-optical_thermometer
Optical properties of rocks and minerals
Optical mineralogy is the study of minerals and rocks by measuring their optical properties. Most commonly, rock and mineral samples are prepared as thin
Optical_mineralogy
Japanese manufacturer
Densan Koparu Kabushiki-gaisha), or Copal, is a Japanese manufacturer of optical, electronic and mechanical equipment, primarily for the photographic industry
Nidec_Copal_Corporation
LC, MU, SMA connectors with round or square type press button. A fiber optic coupler is a device used in optical fiber systems with one or more input
Fiber-optic_adapter
Array of numbers
light ray's slope and its distance from the optical axis, while the matrix encodes the properties of the optical element. There are two kinds of matrices
Matrix_(mathematics)
Optical instrument for non-contact measurement of angles
is an optical instrument for non-contact measurement of angles. They are typically used to align components and measure deflections in optical or mechanical
Autocollimator
SI unit of time
These caesium clocks also underpin optical frequency measurements. Optical clocks are based on forbidden optical transitions in ions or atoms. They have
Second
Copeland & Edward Piotrowski c-14m November 14, 1961 Video Light: Lenses and Optical Instruments Paul L. Copeland & Edward Piotrowski c-14m October 2, 1961
List_of_Coronet_Films_films
(MFD) is a measure of the width of an irradiance distribution, i.e., the optical power per unit area, across the end face of a single-mode fiber. It is
Mode_field_diameter
position sensitive device and/or position sensitive detector (PSD) is an optical position sensor (OPS) that can measure a position of a light spot in one
Position_sensitive_device
current squared and hence to optical power squared. Therefore, RIN is usually presented as relative fluctuation in the square of the optical power in
Relative_intensity_noise
Theoretical formula used in LASIK surgery
micrometres) per diopter of refractive change is equal to the square of the diameter of the optical ablation zone measured in millimeters, divided by three
Munnerlyn_Formula
Mathematical paradox and logic puzzle
Loyd and Schlömilch is a falsidical paradox based on an optical illusion. A chessboard or a square with a side length of 8 units is cut into four pieces
Chessboard_paradox
Digital optical disc data storage format
The compact disc (CD) is a digital optical disc data storage format co-developed by Philips and Sony to store and play digital audio recordings. It employs
Compact_disc
Height/width proportion of an image
produced by superimposing an optical soundtrack over a full-gate 1.3 aperture in printing, resulting in an almost square image. Films shot in this ratio
Aspect_ratio_(image)
Japanese optics company and brand owned by Ricoh
Corporation (ペンタックス株式会社, Pentakkusu Kabushiki gaisha) was a Japanese camera and optical equipment manufacturer. Currently, it exists as Pentax Medical, a division
Pentax
Measure of power reflected by a discontinuity in a line or fiber
power of the signal reflected by a discontinuity in a transmission line or optical fiber. This discontinuity can be caused by a mismatch between the termination
Return_loss
Apollo spacecraft guidance system
angles to signals usable for servo control optical units, a Space Sextant for the CM and an Alignment Optical Telescope for the LM a mechanical frame, called
Apollo_PGNCS
figure, such as a circle or square, superimposed over a background of radial lines or concentric circles. The result is an optical illusion in which both the
Orbison_illusion
Metric in general relativity
The optical metric was defined by German theoretical physicist Walter Gordon in 1923 to study the geometrical optics in curved space-time filled with
Optical_metric
Photometric measure
means that for an ideal optical system, the luminance at the output is the same as the input luminance. For real, passive optical systems, the output luminance
Luminance
Refractive property of materials
the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic
Birefringence
2025 smartphone by Apple
of sensor crop to emulate an optical-quality 8× zoom. As a result, the iPhone 17 Pro and Pro Max have the best optical-quality telephoto lens on any
IPhone_17_Pro
Statistical study of photon counting
^{2}}}} After N {\displaystyle N} steps, the expectation value of the radius squared is ⟨ | β ( t ) | 2 ⟩ = 2 σ 2 = N {\displaystyle \langle {\left\vert \beta
Photon_statistics
Optical analog video disc format
LaserDisc (LD) is a home video format and the first commercial optical disc storage medium. It was developed by Philips, Pioneer, and the movie studio
LaserDisc
Property in optics
ratio of the speed of light in vacuum (c) to the speed of light in a given optical medium (v), n=c/v. The refractive index determines how much the path of
Refractive_index
Ratio of the desired signal to the background noise
Therefore the optical power of the measurement arm is directly proportional to the electrical power and electrical signals from optical interferometry
Signal-to-noise_ratio
バッジどろぼう DP2 1973 219 845 145 Shiverincense ゾクゾク線香 DP2 1974 312 846 145 Optical Ivy 光ファイバーつた DP2 1986 1227 847 145 The Misery Meter いやな目メーター DP2 1974 292
List_of_Doraemon_chapters
American manufacturer of tools
recently, they have expanded their high-end metrology equipment including optical comparators, vision systems, laser measurement, force and material measurement
L._S._Starrett_Company
Solid-state photodetector
single-photon experimentation within physics, fluorescence lifetime microscopy, optical communications (particularly quantum key distribution), digital night vision
Single-photon_avalanche_diode
Mass per unit area
related concept is optical depth. In astronomy, the column density is generally used to indicate the number of atoms or molecules per square cm (cm2) along
Area_density
Logarithmic unit expressing the ratio of physical quantities
the represented intensity (optical power) is directly proportional to the voltage generated by the sensor, not to its square, as in a CCD imager where
Decibel
McNeill Alexander, Professor of Zoology; WABOT-2 of Waseda University, optical music recognition and the NHK Symphony Orchestra of Japan conducted by
List_of_Equinox_episodes
Quasiparticle of mechanical vibrations
condensed matter, specifically in solids and some liquids. In the context of optically trapped objects, the quantized vibration mode can be defined as phonons
Phonon
Optical imaging technique
Spectroscopic optical coherence tomography (SOCT) is an optical imaging and sensing technique, which provides localized spectroscopic information of a
Spectroscopic optical coherence tomography
Spectroscopic_optical_coherence_tomography
Optical illusion
The Ehrenstein illusion is an optical illusion of brightness or color perception. The visual phenomena was studied by the German psychologist Walter H
Ehrenstein_illusion
that, in combination with equine and human performances, would produce optical and technological marvels corresponding to the Burgundian entremets for
Cultural depictions of Maximilian I, Holy Roman Emperor
Cultural_depictions_of_Maximilian_I,_Holy_Roman_Emperor
OPTICAL SQUARE
OPTICAL SQUARE
Male
Japanese
(åœä¸€) Japanese name KEIICHI means "square jewel first (son)."
Female
Japanese
(1-æµ, 2-æ…¶, 3-æ¡‚, 4-敬, 5-å•“, 6-åœ, 7-景) Japanese name KEI means 1) "blessed, lucky," 2) "happy," 3) "katsura tree," 4) "respectful," 5) "spring," 6) "square jewel," or "sunny."Â
Surname or Lastname
English (of Norman origin)
English (of Norman origin) : status name for a person who was in charge of the arrangements for hunting on a lord’s estate, from Anglo-Norman French gros ‘great’, ‘chief’ (see Gross) + veneo(u)r ‘hunter’ (Latin venator, from venari ‘to hunt’).This is the name of one of the wealthiest families in Britain, which holds the title Duke of Westminster. They have been long established in Cheshire, with strong links with the city of Chester. One of the earliest recorded bearers of the name was Robert le Grosvenor of Budworth, who was granted lands by the Earl of Chester in 1160. The family’s fortunes were founded by Thomas Grosvenor (born 1656), who in 1677 married an heiress, Mary Davies, whose inheritance included Ebury Farm, Middlesex. This now forms an area of central London that includes Grosvenor Square and Belgrave Square.
Biblical
square; chariot with team of four horses
Female
Japanese
(1-æµå, 2-æ…¶å, 3-æ¡‚å, 4-敬å, 5-å•“å, 6-åœå, 7-景å) Japanese name KEIKO means 1) "blessed, lucky child," 2) "happy child," 3) "katsura tree child," 4) "respectful child," 5) "spring child," 6) "square jewel child," or 7) "sunny child."
Boy/Male
Biblical
Square, chariot with team of four horses.
Male
Japanese
(1-æµ, 2-ä½³, 3-敬, 4-åœ, 5-æ…§) Japanese name KEI means 1) "blessed, lucky," 2) "excellent," 3) "respect," 4) "square jewel," or 5) "wise."
Surname or Lastname
Irish and Manx
Irish and Manx : reduced Anglicized form of Gaelic Mac Guaire (see McQuarrie).English (of Norman origin) : nickname for a thickset or portly man, from Anglo-Norman French quaré ‘square’. Compare Carré (see Carre).English : from Middle English quarey ‘quarry’, a topographic name for someone who lived near a stone quarry, or a metonymic occupational name for someone who worked in one.
Girl/Female
Indian
Optional
Biblical
the fourth; a square; that lies or stoops down
Surname or Lastname
North German
North German : topographic name from Middle Low German plas ‘place’, ‘open square’, ‘street’.South German (also Pläss) : from a short form of the medieval personal name Blasius.English : variant of Place 3.
Male
Chinese
square, in the sense of correctness.
Surname or Lastname
English
English : variant of Taggart.Possibly an altered spelling of French Target, a nickname for someone who carried a square buckler, Old French targe.
Boy/Male
Biblical
The fourth, a square, that lies or stoops down.
OPTICAL SQUARE
OPTICAL SQUARE
Girl/Female
Hindu, Indian
Unparalleled Kindness; Extremely Good Looking
Boy/Male
Tamil
Vidyut | விதà¯à®¯à¯à®¤Â
A flash of lightening, Brilliant
Girl/Female
Bengali, Indian, Telugu
Wonder
Girl/Female
Muslim/Islamic
Fragarance amber, sky
Boy/Male
Hindu
Prosperous
Girl/Female
Arabic, Muslim
Respected; One who Gives Respect; Respectful
Biblical
same as Joshua
Boy/Male
Irish
The son of the legendary warrior Fionn Mac Cool (read the legend) and the goddess Sive. His mother was turned into a deer by the Dark Druid and she reared him in the forest until he was seven years old. When Fionn was out hunting he found the child and recognising him as his son, gave him the name oisinâ€â€little deer.â€â€ He is best remembered for his love for “â€Niamh of the Golden Hairâ€â€ with whom he spent 300 years in Tir-na-nOg, (“â€Land of Eternal Youthâ€â€) (read the legend). (Read the legend of Oisin and Niamh.) A very popular name again in Ireland.
Boy/Male
Buddhist, Indian
Health and Happiness
Boy/Male
British, English
From Wake's Field
OPTICAL SQUARE
OPTICAL SQUARE
OPTICAL SQUARE
OPTICAL SQUARE
OPTICAL SQUARE
a.
Of or pertaining to vision or sight.
a.
Involving an option; depending on the exercise of an option; left to one's discretion or choice; not compulsory; as, optional studies; it is optional with you to go or stay.
n.
A reflecting optical glass or instrument; a mirror.
a.
Expressed in metrical form; exhibiting the imaginative or the rhythmical quality of poetry; as, a poetical composition; poetical prose.
a.
One skilled in optics.
adv.
By optics or sight; with reference to optics.
n.
Of or pertaining to a place; limited; logical application; as, a topical remedy; a topical claim or privilege.
n.
The space covered by an optical instrument at one view.
a.
Of or pertaining to a vortex or vortexes; resembling a vortex in form or motion; whirling; as, a vortical motion.
n.
An optical glass that is convex on both sides.
n.
An optical toy similar to the phenakistoscope. See Phenakistoscope.
n.
An optical glass; a telescope.
a.
Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye.
a.
Alt. of Optical
a.
Relating to the science of optics; as, optical works.
a.
Topical.
a.
Belonging to, or consisting of, bark or rind; resembling bark or rind; external; outer; superficial; as, the cortical substance of the kidney.
n.
An instrument for showing the optical effects of color.
n.
Of or pertaining to the science of vision; optical.
a.
One who deals in optical glasses and instruments.