OPTICAL - ορισμός. Τι είναι το OPTICAL
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  1. Λεξικά
  2. Αγγλικό λεξικό
  3. OPTICAL

Τι (ποιος) είναι OPTICAL - ορισμός

BRANCH OF PHYSICS CONCERNING LIGHT
Optic; Optical; Classical optics; Optical device; Optical system; Optics (physics); Light physics; Applications of optics; Optical physicist; Optical component
  • 300x300px
  • polarising filter]] on the sky in a photograph. Left picture is taken without polariser. For the right picture, filter was adjusted to eliminate certain polarizations of the scattered blue light from the sky.
  • When oil or fuel is spilled, colourful patterns are formed by thin-film interference.
  • Diffraction on two slits separated by distance <math>d</math>. The bright fringes occur along lines where black lines intersect with black lines and white lines intersect with white lines. These fringes are separated by angle <math>\theta</math> and are numbered as order <math>n</math>.
  • fovea]], 30. [[retina]].
  • A colourful sky is often due to scattering of light off particulates and pollution, as in this photograph of a sunset during the [[October 2007 California wildfires]].
  • the law of refraction]]
  • Photograph taken with aperture {{f/}}32
  • Photograph taken with aperture {{f/}}5
  • The first treatise about optics by [[Johannes Kepler]], ''Ad Vitellionem paralipomena quibus astronomiae pars optica traditur'' (1604)
  • thumb
  • Conceptual animation of light dispersion through a prism. High frequency (blue) light is deflected the most, and low frequency (red) the least.
  • A polariser changing the orientation of linearly polarised light. <br>In this picture, ''θ''<sub>1</sub> – ''θ<sub>0</sub>'' = ''θ<sub>i</sub>''.
  • Experiments such as this one with high-power [[laser]]s are part of the modern optics research.
  • The Nimrud lens
  • Cover of the first edition of Newton's ''Opticks'' (1704)
  • Circular polarization diagram
  • Elliptical polarization diagram
  • Linear polarization diagram
  • The Ponzo Illusion relies on the fact that parallel lines appear to converge as they approach infinity.
  • Geometry of reflection and refraction of light rays
  • Diagram of specular reflection
  • Illustration of Snell's Law for the case n<sub>1</sub> < n<sub>2</sub>, such as air/water interface
  • Board with optical devices, 1728 Cyclopaedia
  • Cyclopaedia]]''
  • archive-date=3 July 2014}}</ref>
  • Images of black letters in a thin convex lens of focal length ''f''&nbsp; are shown in red. Selected rays are shown for letters '''E''', '''I''' and '''K''' in blue, green and orange, respectively. Note that '''E''' (at 2''f'') has an equal-size, real and inverted image; '''I''' (at ''f'') has its image at infinity; and '''K''' (at ''f''/2) has a double-size, virtual and upright image.
  • Dispersion: two sinusoids propagating at different speeds make a moving interference pattern. The red dot moves with the [[phase velocity]], and the green dots propagate with the [[group velocity]]. In this case, the phase velocity is twice the group velocity. The red dot overtakes two green dots, when moving from the left to the right of the figure. In effect, the individual waves (which travel with the phase velocity) escape from the wave packet (which travels with the group velocity).

optical         
Optical devices, processes, and effects involve or relate to vision, light, or images.
...optical telescopes.
...the optical effects of volcanic dust in the stratosphere.
ADJ: usu ADJ n
Optical         
·adj Of or pertaining to vision or sight.
II. Optical ·adj Relating to the science of optics; as, optical works.
III. Optical ·adj 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.
optical         
a.
See optic

Βικιπαίδεια

Optics

Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties.

Most optical phenomena can be accounted for by using the classical electromagnetic description of light, however complete electromagnetic descriptions of light are often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive model of light, which includes wave effects such as diffraction and interference that cannot be accounted for in geometric optics. Historically, the ray-based model of light was developed first, followed by the wave model of light. Progress in electromagnetic theory in the 19th century led to the discovery that light waves were in fact electromagnetic radiation.

Some phenomena depend on light having both wave-like and particle-like properties. Explanation of these effects requires quantum mechanics. When considering light's particle-like properties, the light is modelled as a collection of particles called "photons". Quantum optics deals with the application of quantum mechanics to optical systems.

Optical science is relevant to and studied in many related disciplines including astronomy, various engineering fields, photography, and medicine (particularly ophthalmology and optometry, in which it is called physiological optics). Practical applications of optics are found in a variety of technologies and everyday objects, including mirrors, lenses, telescopes, microscopes, lasers, and fibre optics.

https://en.wikipedia.org/wiki/Optics
Παραδείγματα από το σώμα κειμένου για OPTICAL
1. Keck Observatory in Hawaii, the world‘s largest optical telescope.
2. The site is part of the National Optical Astronomy Observatory in Tucson, and it supports 22 optical and two radio telescopes from eight research institutions.
3. Zuhair Ali Hassan Azhar, CEO of Optical Communications, said his consortium would provide optical services to meet the requirements of business and residential sectors within a year.
4. In 2006, the MPA‘s operations in Asia–Pacific resulted in the seizure of 35 million illegal optical discs, 50 production lines and 4,482 optical disc burners.
5. Dating techniques included radiocarbon dating and optical stimulated luminescence.
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