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 lens (optics) - Definition 

Lens (optics) (14374 bytes)
1: ...ptical device. For other uses, see the list at [[lens]].''
3: ...also called lenses: for instance, a [[microwave]] lens can be made from [[paraffin wax]].
5: ...ses through it, in a similar manner to a [[prism (optics)|prism]].
9: ...med an image on the [[retina]]. Widespread use of lenses did not occur until the invention of [[spectacl...
11: ==Lens construction==

Optics (4518 bytes)
3: ...d the interaction of [[light]] with [[matter]]. Optics explains and is illuminated by [[optical phenomen...
5: ...antum]] nature of light and as such some areas of optics are also related to [[quantum mechanics]].
7: Optics, however, as a field is often considered largely ...
11: ==Classical optics==
12: ...ometimes called '''ray optics''' is the branch of optics that describes [[light]] [[propagation]] in terms...

Crystal optics (6859 bytes)
1: '''Crystal optics''' is the branch of [[optics]] that describes the behaviour of [[light]] in ''...
70: Certain [[nonlinear optics|nonlinear optical]] phenomena such as the [[elect...
83: [[Category:Optics]]

Focus (optics) (1996 bytes)
1: ... if it came from the other. The distance from the lens or mirror surface to the focus is called the ''[[...
3: ...o be emanating from, after it travels through the lens or reflects from the mirror. A [[convex]] [[para...
5: ...ocal point is closest to the front surface of the lens, and the back focal point closest to the back sur...
11: [[nl:Brandpunt van een lens]]
12: [[Category:Optics]]

Dispersion (optics) (8626 bytes)
3: In [[optics]], '''dispersion''' is a phenomenon that causes t...
7: ==Material dispersion in optics==
9: In [[optics]], the ''phase velocity'' of a wave ''v'' in a gi...
17: ...[[optical spectrum|color spectrum]] by a [[Prism (optics)|prism]]. From [[Snell's law]] it can be seen tha...
45: ... a form of optical pulse which uses a [[nonlinear optics|nonlinear optical]] effect to self-maintain its s...

Filter (optics) (4358 bytes)
1: [[Image:Filter-optics-1.jpg|right|320px|Coloured and ND filters]]
24: [[category:optics]]

Active optics (1929 bytes)
1: ...echnology]] for [[reflecting telescope]]s. Active optics works by "actively" adjusting the telescope's [[m...
7: ... obtain the best possible image is termed "active optics".
9: ...), wind, telescope axis deformation, etc. Active optics correct all factors that may affect image quality...
11: ...ted with primary mirrors. For these, the adaptive optics technology has been developed for use with small ...

Transparency (optics) (1619 bytes)
1: In [[optics]], '''transparency''' is the property of being ''...
13: [[Category:Optics]]

Fourier optics (2031 bytes)
1: To explain the basic principle of '''Fourier optics''', it might be useful to consider the analogue w...
3: ...ern after having passed through a [[lens (optics)|lens]]. If the object is at [[infinity]], the diffract...
7: ... before imaging the diffraction pattern through a lens.
9: Fourier optics are named after [[Joseph Fourier]].
11: More reading on this subject: Hecht /Zajac OPTICS, Addison-Wesley Publishing Comp.

Coma (optics) (1469 bytes)
1: ...ain optical designs or due to imperfection in the lens or other components which results in off-axis poi...

Quantum optics (6213 bytes)
1: '''Quantum optics''' is a field of research in [[physics]], dealing...
3: == History of quantum optics ==
5: ...lowing from it not only form the basis of quantum optics but also were crucial for the development of quan...
7: ...n the properties of light, and the name ''quantum optics'' became customary.
9: ...se soon proved very fruitful, interest in quantum optics rose. A clearer understanding of the [[statistica...

Photometry (optics) (5745 bytes)
1: '''Photometry''' is a term used in [[physics]], [[optics]], and [[illuminating engineering]] for the measu...
59: [[Category:Optics]]

Prism (optics) (2328 bytes)
2: ...cs)|reflect]] it or break it up (to [[dispersion (optics)|disperse]] it) into its constituent spectral [[c...
8: ...index depends on [[frequency]] (see [[dispersion (optics)|dispersion]]); the white light entering the pris...
10: ...uded that prisms separate colors. He also used a lens and a second prism to recompose the rainbow into ...
43: [[Category:Optics]]

Adaptive optics (2940 bytes)
1: ...ptive optics should not be confused with [[active optics]], which works on a longer timescale to correct t...
5: An adaptive optics system tries to correct these distortions, using ...
9: ...essity of a reference star means that an adaptive optics system cannot work everywhere on the sky, but onl...
15: Adaptive optics technology has also been used recently to image i...
19: *[[active optics]]

Absorption (optics) (509 bytes)
1: '''Absorption''', in [[optics]], is the process by which the [[energy]] of a [[...
7: [[category:optics]]

Nonlinear optics (12012 bytes)
1: '''Nonlinear optics''' is the branch of [[optics]] that describes the behaviour of [[light]] in ''...
3: Nonlinear optics gives rise to a host of optical phenomena:
18: ***[[Kerr-lens modelocking]] (KLM).
35: *Acousto-optics, the refractive index is affected by acoustic wav...
123: ...hysics and technology], with content on nonlinear optics, by Rüdiger Paschotta

Diaphragm (optics) (1211 bytes)
4: ...phragm coincides with the [[optical axis]] of the lens system.
6: ...age:lens aperture top.jpg|240px|thumb|left|A 35mm lens set to [[f-number|f/8]]; the diameter of the [[he...
9: ...n in optical systems|aberrations]] of the optical lens system and increases the [[depth of field]]. The ...

Electro-optics (951 bytes)
1: In [[telecommunication]], '''electro-optics''' is the technology associated with those compon...

Thin-film optics (1765 bytes)
1: ...fferent materials. In order to exhibit thin-film optics, the thickness of the layers of material must be ...
5: ... car headlights, and for high precision [[filter (optics)|optical filters]] and [[mirror]]s.
9: [[Category:Optics]]

Organic Nonlinear Optics (484 bytes)
1: ...subfield is much broader than inorganic nonlinear optics both in the number of materials studied and the w...
3: [[Category:Optics]]

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "lens (optics)".