prisms, and that familiar experiments in optics could be repeated with electric waves which could not affect the eye.
It accordingly comments on the Sphaerica of Theodosius, the Moving Sphere of Autolycus, Theodosius's book on Day and Night, the treatise of Aristarchus On the Size and Distances of the Sun and Moon, and Euclid's Optics and Phaenomena.
Schuster, Theory of Optics, p. 115.
But his researches in physical optics constitute his chief title-deed to immortality.
Of recent years most treatises on physical optics, e.g.
This resolution of the original wave is the well-known "Principle of Huygens," and by its means he was enabled to prove the fundamental laws of optics, and to assign the correct construction for the direction of the extraordinary ray in uniaxial crystals.
Wood, Physical Optics.) According to A.
Many other points of physiological optics are touched on, in general erroneously.
There is a great deal of practical information on lenses in connexion with the camera and other optical instruments, and the book is valuable as a repertory of early practical optics, also for the numerous references to and extracts from previous writers.
At a later period he was one of the leading contributors to the Encyclopaedia Britannica (seventh and eighth editions), the articles on Electricity, Hydrodynamics, Magnetism, Microscope, Optics, Stereoscope, Voltaic Electricity, &c., being from his pen.
He died on the 5th of June 1716, leaving unfinished a series of elaborate retearches on optics, and a large amount of unpublished manuscript.
Various writers on optics in the 17th century discussed the principle of the simple dark chamber alone and with single or compound lenses, among them Jean Tarde (Les Astres de Borbon, 1623); Descartes, the pupil of Kepler (Dioptrique, 1637); Bettinus (Apiaria, 1645); A.
Attempts have been made, principally founded on some remarks of Huygens, to show that Descartes had learned the principles of refraction from the manuscript of a treatise by Willebrord Snell, but the facts are uncertain; and, so far as Descartes founds his optics on any one, it is probably on the researches of Kepler.
The following branches have especially felt his influence: - chemical physics, capillarity and viscosity, theory of gases, flow of liquids, photography, optics, colour vision, wave theory, electric and magnetic problems, electrical measurements, elasticity, sound and hydrodynamics.
In optics he was the first, in 1802, to observe the dark lines in the solar spectrum.
For the theory of dispersion see P. Drude, Theory of Optics (Eng.
Wood, Physical Optics; and A.
The chief of his other contributions to optics was the explanation of the rainbow - an explanation far from complete, since the unequal refrangibility of the rays of light was yet undiscovered - but a decided advance upon his predecessors, notably on the De radiis visas et lucis (1611) of Marc-Antonio de Dominis, archbishop of Spalato.
In addition to the various works of Brewster already noticed, the following may be mentioned: - Notes and Introduction to Carlyle's translation of Legendre's Elements of Geometry (1824); Treatise on Optics (1831); Letters on Natural Magic, addressed to Sir Walter Scott (1831); The Martyrs of Science, or the Lives of Galileo, Tycho Brake, and Kepler (1841); More Worlds than One (1854).
According to common optics, where images are absolute, the diffraction pattern is supposed to be infinitely small, and two radiant points, however near together, form separated images.
Having entered the Society of Jesus in 1586, he was successively professor of philosophy at Douai and rector of the Jesuit College at Antwerp. He wrote a treatise on optics in six books (Antwerp, 1613), notable for containing the principles of stereographic projection.
The results of his leisure were in 1787 a new translation of Newton's Optics, and in 1788 his Memoires academiques, ou nouvelles decouvertes sur la lumiere.
For descriptive accounts, see Wood's Physical Optics, T.
Sir Isaac Newton appears to have been the first to use a glass globe instead of sulphur (Optics, 8th Query).
Thanks to Fresnel and his followers, this department of optics is now precisely the one in which the theory has gained its greatest triumphs.
A preliminary study of optics led to the publication, in 1604, of his Astronomiae pars optica, containing important discoveries in the theory of vision, and a notable approximation towards the true law of refraction.
(For the optics of sodium vapour see R.
11 Astronomical inquiries in connexion with optics, meteorological phenomena, and, in a word, the whole field of natural laws, excited his desire to explain them.
In optics, it is that portion of the diameter of an object-glass or mirror through which light can pass free from obstruction.
Archbishop Peckham, or Pisanus, in his Perspectiva Communis (1279), and Vitello, in his Optics (1270), also attempted the solution of Aristotle's problem, but unsuccessfully.
Arbes have used a method depending on total reflection (Drude's Theory of Optics, p. 394).
The present writer, therefore, in his Theory of Optics, adopted different names, and called the series respectively the " Trunk," the " Main Branch " and the " Side Branch," the main branch being identical with the second subordinate series; the limit of frequency for high values of s is called the " root " of the series, and it is found in all cases that the two branches have a common root at some point in the trunk.
s Schuster, Theory of Optics, p. 254 ' Wied.
grammar, music, painting, sculpture, medicine, geometry, mathematics and optics; c. 2 is on the general principles of architectural design; c. 3 on the considerations which determine a design, such as strength, utility, beauty; c. 4 on the nature of different sorts of ground for sites; c. 5 on walls of fortification; c. 6 on aspects towards the north, south and other points; c. 7 on the proper situations of temples dedicated to the various deities.
He also wrote at this time a translation of Newton's Optics, for which the author presented him with Soo.
His work was mainly concerned with electricity and magnetism, though he also made some contributions to optics and physiology.
Devoting himself next to optics, he produced memoirs which entitle him to a high place among the early, searchers after a true dynamical theory of light.
The Vindex episode, referred to in the Six Lessons, becomes intelligible only by going beyond Molesworth to the original Latin edition of 1655 They were composed originally, in a somewhat different and rather more extended form, as the second part of an English treatise on Optics, completed by the year 1646.
optics and spectroscopy.
He now employed himself in making optical glasses, and in engraving on metal, devoting his spare time to the perusal of works on mathematics and optics.
Wood's Physical Optics.
DISPERSION, in OPTICS.
Schuster, Theory of Optics.
Heath, Geometrical Optics.
He studied at Rome and Bologna, and at the age of twenty went to Paris, where he enjoyed the friendship of Voltaire and produced his great work Neutonianismo per le dame, a work on optics.
His investigations occupied almost the whole field of science, including physiology, physiological optics, physiological acoustics, chemistry, mathematics, electricity and magnetism, meteorology and theoretical mechanics.
Helmholtz's contributions to physiological optics are of great importance.
His great work on Physiological Optics (1856-1866) is by far the most important book that has appeared on the physiology and physics of vision.
For the later years of his life his labours may be summed up under the following heads: (1) On the conservation of energy; (2) on hydro-dynamics; (3) on electro-dynamics and theories of electricity; (4) on meteorological physics; (5) on optics; and (6) on the abstract principles of dynamics.
Abbe on geometrical optics, originally published only in his university lectures, were first compiled by S.
(1) Aberration of the third order of axis points is dealt with in all text-books on optics.
Taylor, A System of Applied Optics (1906); reference may also be made to R.
Heath, A Treatise on Geometrical Optics (2nd ed., 1895); and L.
Herman, A Treatise on Geometrical Optics (1900).
Heath's Geometrical Optics, chaps.
Arago's fame as an experimenter and discoverer rests mainly on his contributions to magnetism and still more to optics.
Alhazen was, nevertheless, a diligent and successful student, being the first great discoverer in optics after the time of Ptolemy.
His treatise on optics was translated into Latin by Witelo (1270), and afterwards published by F.
In optics, the term caustic is given to the envelope of luminous rays after reflection or refraction; in the first case the envelope is termed a catacaustic, in the second a diacaustic. Catacaustics are to be observed as bright curves when light is allowed to fall upon a polished riband of steel, such as a watch-spring, placed on a table, and by varying the form of the spring and moving the source of light, a variety of patterns may be obtained.
Heath's Geometrical Optics and R.
Herman's Geometrical Optics (1900).
The laws of light and shade, the laws of "perspective," including optics and the physiology of the eye, the laws of human and animal anatomy and muscular movement, those of the growth and structure of plants and of the powers and properties of water, all these and much more furnished food almost from the beginning to his insatiable spirit of inquiry.
Wood, Physical Optics (1905); R.
His researches in optics, continued until his death, appear to have been begun about the year 1814, when he prepared a paper on the aberration of light, which, however, was not published.
absorbere) means literally "sucking up" or "swallowing," and thus a total incorporation in something, literally or figuratively; it is technically used in animal physiology for the function of certain vessels which suck up fluids; and in light and optics absorption spectrum and absorption band are terms used in the discussion of the transformation of rays in various media.
Schuster's Theory of Optics (1904); P. K.
Drude's Theory of Optics (Eng.
They were written at the request of the princess of Anhalt-Dessau, and contain an admirably clear exposition of the principal facts of mechanics, optics, acoustics and physical astronomy.
The step from optics i to dynamics in the application of the method of " Varying Action " was made in 1827, and communicated to the Royal Society, in whose Philosophical Transactions for 1834 and 1835 there are two papers on the subject.
That Newton must have begun early to make careful observations of natural phenomena is sufficiently testified by the following remarks about halos, which appear in his Optics, book ii.
It was his duty as professor to lecture at least once a week in term time on some portion of geometry, arithmetic, astronomy, geography, optics, statics, or some other mathematical subject, and also for two hours in the week to allow an audience to any student who might come to consult with the professor on any difficulties he had met with.
The subject which Newton chose for his lectures was optics.
The success which attended his researches in optics must have been great, although the results were known only through his own oral lectures, until he presented an account of them to the Royal Society in the spring of 1672.
He subsequently published many papers in the Philosophical Transactions on various parts of the science of optics, and, although some of his views have been found to be erroneous, and are now almost universally rejected, his investigations led to discoveries which are of permanent value.
A further account of the method was given in the first edition of Newton's Optics, which appeared in 1704.
This was the time of rapid development in the universities, where not only were the scholastic philosophy i~ and systematic theology eagerly studied, but figures, ~j1,iJlife appear like that of the great Roger Bacon, a scientific researcher of the first rank, whose discoveries in optics and chemistry caused his contemporaries to suspect him of magical arts.
He also published a treatise, in 1761, De distributione caloris per tellurem, and he was the author of memoirs on different subjects in astronomy, mechanics, optics and pure mathematics, contained in the journals of the learned societies of St Petersburg and Berlin.
Uncertainty as to his future led him to accept an invitation from the king of France to Paris, where he was naturalized and was appointed director of optics for the marine, an office instituted for him, with a pension of 8000 livres.
Schuster, An Introduction to the Theory of Optics (1904); R.
Wood, Physical Optics (1905); E.
According to the laws of optics it is only possible either to portray a small object near one of the foci of the system with wide pencils, or to produce an image from a relatively large object by correspondingly narrow pencils.
In optics, he developed the wave theory, and his name is associated with the simple dispersion formula.
Free Space Optics offer gigabit alternatives for distribution around cities.
adaptive optics slightly larger reference sources may be used.
The mechanics of the Copernican astronomy of Galileo attracted him and he also studied Kepler ' s Optics.
collimateer heads, come with collimating optics and can be fitted with single or multimode optical fibers.
collimator optics and can be fitted with optical fibers.
When elementary particles collide at high energies they diffract off each other, just like waves of light diffract around apertures in ordinary optics.
POWER OUTPUT The maximum output power emitted by the laser diode is reduced by the module optics.
Prevent the use of any external optics that could decrease the beam divergence or its diameter.
Bresser Skylux 70mm equatorial Refractor - £ 89.99 The New Bresser Skylux offers sharp high quality optics on a sturdy equatorial mount.
The traditional design features fully waterproof multi-coated optics and retractable eyecups for spectacle wearers.
Fiber Optics - Also called optical fiber Optics - Also called optical fibers or optical fiber bundles.
fiber optics, UV light, LEDs.
fiber optics networks are not completely optical.
fiber optics cable which circled the earth and which, the committee solemnly promised, would revolutionize worldwide telecommunication.
fibre aim of the Center is to carry out research on components for telecommunications in the area of " fiber optics " .
Fully multi coated optics deliver optimum brightness and color fidelity.
Clearly the luminous flux of a light source is of little value in isolation; the light will be changed by the optics.
Applications of optics and SLM devices, including neural networks, telecommunications switches, WDM switches, volume holography and tuneable lasers.
This unit has optics which add together two of the dye laser photons, effectively doubling their frequency.
luminous flux of a light source is of little value in isolation; the light will be changed by the optics.
millimeter wave technology has been dubbed " wireless optics " since it provides gigabit high-speed throughput between transmission sites.
nitride membrane mirror which is suitable for adaptive optics.
All Hilkinson Binoculars have fully multi-coated optics and have either BK-7 or BAK-4 prisms.
To disseminate among Members and others, information on all matters affecting dispensing optics, and publish written material as appropriate.
Offering brilliant viewing due to the multi-coated optics, users find this a great companion on the water.
For adaptive optics slightly larger reference sources may be used.
PainlevÃ© equations arise in many applications including models of water waves, nonlinear optics, general relativity, and in differential geometry.
Photonics Focus dropped into a session where speakers approached diffractive optics from extreme ends of the power spectrum.
Geometrical optics are a useful tool for calculating reflections from the polygons in a 3D database.
Take in the view at high power through bright crisp multi coated optics.
We also work with fiber optics, UV light, LEDs.
His work in theoretical quantum optics recently predicted the existence of the optical analog of " black holes " .
precision optics backed by 60 years of Canon development ensure crisp, clear results.
To help you to choose a telescope or binoculars, or to understand telescope optics visit my Choosing a Telescope page.
This covers areas from accelerator physics through engineering design, ion optics, radio-frequency engineering, magnet design and a host more.
Fiber Optics - Also called optical fibers or optical fiber bundles.
optics of the eye, resulting in changes in the quality of the retinal image.
optics of the microscope may improve the results.
Note: The strings listed below for the focal plane instrumentation are sufficient to imply the HRMA provided the focusing optics.
optics used is selected in the measure tab drop down menu shown below.
Two techniques, active optics and adaptive optics has been devised to overcome these.
The ' hierarchy of optics ' from quantum optics down to paraxial geometrical optics - how does it all fit together?
It can be separated from the upper body very easily to permit cleaning of the internal optics.
Physical optics are the ' active optics ' of the time of the speed of light.
optics supplier, with nearly 50% of European output.
optics industry is a world-class science base.
optics systems to overcome these limitations.
optics control in addition to directing the tip/tilt secondary mirror.
Currently, fiber optics networks are not completely optical.
Within Europe, the UK is the largest fiber optics supplier, with nearly 50% of European output.
Experiments: My journey to a quantum optics lab in Malvern started on the slopes of Italian Dolomites.
Even more complicated integrated atom optics devices and networks, similar to integrated circuits for electrons, can be devised.
The millimeter wave electric company technology has been dubbed " wireless optics " since it provides gigabit high-speed throughput between transmission sites.
The camera optics were surprisingly good for what looked like a tiny pinhole lens.
Fiber optic devices for cross section converters The complete range of fiber optics can be connected to amplifiers with analog outputs.
physiological optics, and psychophysics.
precision glass optics.
All models have the benefit of multi-coated optics and phase coated prisms for extra brightness and clarity.
The topics covered range from antennas, through radiowave propagation, optics and radar, to communications signal processing and networks.
retracts to create an eye-catching lightweight capsule that protects the controls and high-quality optics.
solid-state lasers for this purpose, with the possibility of using fiber optics later.
The optics on this unit are quite superlative, and one nice feature is the spring loaded flip up lens caps.
Most of the others were discovered in visible light, using ground-based telescopes with adaptive optics.
A voyage of discovery through many areas of contemporary physics FROM non-equilibrium thermodynamics to quantum optics in ORDER to understand the problem of life.
The ultimate, cordless trackball fits advanced optics and digital radio technology comfortably into the palm of your hand.
Schuster, Theory of Optics, § 178).
geometrical optics, physical optics, meteorological optics, &c. Greek terminology included two adjectival forms - ra 01rTixfi, for all optical phenomena, including vision and the nature of light, and I) &rTLiO (sc. OEcopfa), for the objective study of light, i.e.
The education for this examination has kept pace with the rapid advances of science, all the following subjects now receiving attention: the microscopical structure of plants and drugs, so as to detect adulterations and impurities in powdered drugs; organic and quantitative analysis, including those of food and drugs, water, soils, gas and urine; optics, so as to enable them to carry out the prescriptions of oculists; spectrum analysis; the use of the polariscope and refractometer; the method of applying RÃ¶ntgen rays; the preparation of glandular secretions and antitoxins; and the chemistry of remedies for the fungoid diseases and insect pests of plants.
In Bode's Jahrbuch (1776-1780) he discusses nutation, aberration of light, Saturn's rings and comets; in the Nova acta Helvetica (1787) he has a long paper "Sur le son des corps elastiques," in Bernoulli and Hindenburg's Magazin (1787-1788) he treats of the roots of equation and of parallel lines; and in Hindenburg's Archiv (1798-1799) he writes on optics and perspective.
van Moerbeek, which was long thought to be a fragment of Ptolemy's Optics, because it bore the title Ptolemaei de speculis in the MS. But the attribution to Ptolemy was shown to be wrong as soon as it was made clear (especially by Martin) that another translation by an Admiral Eugenius Siculus (12th century) of an optical work from the Arabic was Ptolemy's Optics.
From the opening passage of Euclid's Optics (c. 300 B.C.), which formed the foundation for some of the earlier middle age treatises on geometrical perspective, it would appear that the above phenomena of the simple darkened room were used by him to demonstrate the rectilinear propagation of light by the passage of sunbeams or the projection of the images of objects through small openings in windows, &c. In the book known as Aristotle's Problems (sect.
's Gravesande's Essai de perspective (1711), Robert Smith's Compleat System of Optics (1738), Joseph Harris's Treatise on Optics (1775), Charles Hutton's Philosophical and Mathematical Dictionary, and other books on optics and physics of that period.
On his mother's death in 1759 Marat set out on his travels, and spent two years at Bordeaux in the study of medicine, whence he moved to Paris, where he made use of his knowledge of his two favourite sciences, optics and electricity, to subdue an obstinate disease of the eyes.
In optics, the word has two special applications: (1) Aberration of Light, and (2) Aberration in Optical Systems. These subjects receive treatment below.
The scope of his researches was described by Arthur Cayley, his friend and fellow worker, in the following words: "They relate chiefly to finite analysis, and cover by their subjects a large part of it - algebra, determinants, elimination, the theory of equations, partitions, tactic, the theory of forms, matrices, reciprocants, the Hamiltonian numbers, &c.; analytical and pure geometry occupy a less prominent position; and mechanics, optics and astronomy are not absent."
The reason for publishing these two tracts in his Optics, from the subsequent editions of which they were omitted, is thus stated in the advertisement: " In a letter written to M Leibnitz in the year 1679, and published by Dr Wallis, I mentioned a method by which I had found some general theorems about squaring curvilinear figures on comparing them with the conic sections, or other the simplest figures with which they might be compared.
The slim and sleek aluminum body cover retracts to create an eye-catching lightweight capsule that protects the controls and high-quality optics.
Raytheon is working on solid-state lasers for this purpose, with the possibility of using fiber optics later.
Science Drivers for ASMs Currently implemented astronomical AO systems operate like auxiliary instruments separate from the main telescope optics.
The flow cell optics are cleaned at regular operator set intervals by the wiper system.
Eagle Optics Binocular 8x21 - this children's binocular comes in a wide variety of colors to suit both girls and boys.
They can be found at Eagle Optics, Amazon.com and most sporting goods stores.
They have mediocre optics and inexpensive housing.
The higher-end telescopes usually have strong optics, better casing and sturdier bases.
In addition to allowing divers to use their own digital cameras, some waterproof housing units also offer supplementary optics.
Camera Land Inc.: The store opened in 1957 and is now regarded as one of the largest sports optics dealers in the United States.
The optics contained inside a high-end digital SLR camera can make a world of difference between a good image and a great image.
Canon strives to retain its lofty position in the ranks of digital imagery by installing finely constructed optics free of flaws, and the Rebel T2i's unusually high-quality optics are no exception.
Optics offer Lens Peripheral Illumination Correction, which automatically compensates to prevent vignetting and lens shading, resulting in evenly balanced exposures.
Fans of Canon imaging devices will tell you that any EOS Rebel camera is a good investment, but if you'd like more information before opening your pocketbook, check out the Digital Rebel XT's optics, performance and consumer features.
Most enthusiasts that are interested in optical devices like glasses and binoculars easily recognize the name Bausch & Lomb as a symbol of the highest quality optics in the industry.
Many antique dealers specifically search out Bausch and Lomb shooting glasses because of the high resale value of vintage optics from this maker.
Not long after that, the company branched out into manufacturing microscopes, and soon became a leading name in optics throughout the United States.
Because Bausch & Lomb was one of the only U.S. optics manufacturers, it became a major resource for the U.S. military.
Optics Planet - Features not only dozens of Bausch and Lomb products, but also provides lots of informational resources in the form of reviews and tips.
With Optics you won't have to because all of the technological terms associated with Bolle are clearly defined.
Lens Replacement: Not only are lens replacements available at Optics, but complete with diagrams, they'll show you exactly how to do just that!
However, since the night vision goggles have optics that can "see" the infrared light, the dark room appears almost as bright as day.
It's actually called the Rigel Optics LED, Day & Night Vision Goggles Emergency Set; this one's probably a bit more than the average shopper will need.
Polarized Optics has a Protective Hard Carrying Case (PHC #1) for $7.50 that measures 5.30 by 2.50 by .80 inches.
The collection at Go 2 Optics is extensive and the prices are even better!
If you prefer sailing and water skiing to beach bumming, then you will love Hobie's "high performance optics."
Optics Planet has a section that exclusively sells night vision goggles for military and law enforcement use.
High definition optics (HDO) patented technology is used to unlock the peripheral view with wide open clarity.
The Southern California-based company has been in business since 1975 and has grown to include several optics brands, including Oliver Peoples and Paul Smith Spectacles.
You can have them customized without sacrificing the optics of the lenses.
They've accomplished this by offering precise fitting (to block the blinding rays of glare), using their High Definition Optics (for clarity) and by employing lenses that utilize various colors to improve depth perception.
The Iridium coating further helps to maximize the optics of the lenses.
The company first begins by using HDO, or High Definition Optics.
Optics Planet has several options for Rx-able motorcycle goggles as well.
Today, we'll be focused on Optics Planet.
Optics Planet's Bolle Showtime serves up three pairs of goggles with rose-colored lenses.
Eyewear.com has a pair of rose lens ski goggles called Zeal Optics Rapt.
IOC Optics features several Modo collections including Saki.
Smith Optics corrects this by straightening out the incoming rays.
Outside Away highly recommends the Zeal Optics Maestro with the sepia polarized lenses.
Spyder Optics is Spyder's eyewear division.
Cazal eyewear can be found online at sites such as Optics Planet, Frames Direct and Best Buy Eyeglasses.
Smith Optics has been making products for over 40 years.
Smith Optics is best known for their high quality, durable eyewear.
There is a lifetime warranty against any manufacturing defects in workmanship or materials on all Smith Optics eyewear, so if something goes wrong with your Director shades, you will get a repair or replacement at no extra charge.
Action Optics Clip-Ons come in a black metal frame.
To locate a Smith Optics dealer in your area, visit the store locator feature on the Smith website.
Ophthalmic and Physiological Optics 24, no. 3 (2004): 252-57.
Some artificial trees are lit by fiber optics, with the light in the base of the tree and a rotating color wheel that lets a sequence of colors shimmer across the tree.
From sparkling stars and snowflakes to a blinking Christmas tree, fiber optics and LEDs make light-up cards possible.
Computerized technology and the increasing use of fiber optics have helped with speed gains, and the entire phone system remains fairly reliable.
You can take a look at Optics Planet to start off.
Add mood lighting with lava lamps, lightning globes, twinkle lights, or fiber optics.
One of the best options for this is to choose a helmet that has a curved clear spatter shield over the optics region.
OPTICS, the science of light, regarded as the medium of sight (Gr.
127 9, these problems were taken up by three almost contemporaneous writers on optics, two of whom, Roger Bacon and John Peckham, were Englishmen, and Vitello or Witelo, a Pole.
The smaller the hole (so far at least as geometrical optics is concerned) the less confused will the picture be.
Most of Wollaston's original work' deals more or less directly with chemical subjects, but diverges on all sides into optics, acoustics, mineralogy, astronomy, physiology, botany and even art.
We find a precisely analogous effect in optics which justifies the term " electrical image."
Stevinus wrote on other scientific subjects - optics, geography, astronomy, &c. - and a number of his writings were translated into, Latin by W.
Accordingly, for the next three or four years, he remained steadily at work, and nothing appeared from him in public except a short treatise on optics (Tractatus opticus, L.W.
He overhastily concluded from some rough experiments (Optics, bk.
prop. 3) "that all refracting substances diverged the prismatic colours in a constant proportion to their mean refraction"; and he drew the natural conclusion "that refraction could not be produced without colour," and therefore "that no improvement could be expected from the refracting telescope" (Treatise on Optics, p. 112).
a-, privative, xpcopa, colour), in optics,, the property of transmitting white light, without decomposing it into the colours of the spectrum; "achromatic lenses" are lenses which possess this property.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.