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The distinction is irrelevant for an unattenuated wave, but becomes relevant in some cases below. For example, there are two definitions of complex refractive index, one with a positive imaginary part and one with a negative imaginary part, derived from the two different conventions. [2] The two definitions are complex conjugates of each other.
Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer , it describes the absorption and scattering of radiation in a medium , such as a plasma , dielectric , shielding material , glass, etc.
The opposite property of translucency is opacity. Other categories of visual appearance, related to the perception of regular or diffuse reflection and transmission of light, have been organized under the concept of cesia in an order system with three variables, including transparency, translucency and opacity among the involved aspects.
Kramers' opacity law describes the opacity of a medium in terms of the ambient density and temperature, assuming that the opacity is dominated by bound-free absorption (the absorption of light during ionization of a bound electron) or free-free absorption (the absorption of light when scattering a free ion, also called bremsstrahlung). [1]
In analytic philosophy and computer science, referential transparency and referential opacity are properties of linguistic constructions, [a] and by extension of languages. A linguistic construction is called referentially transparent when for any expression built from it, replacing a subexpression with another one that denotes the same value [b] does not change the value of the expression.
Closing proposal: I've now edited this article to be much smaller and more specific. The quantitative discussion is only on the quantity called specifically "opacity", all the rest was moved to other articles, particularly absorption (electromagnetic radiation). It no longer needs merging. --Steve 14:35, 2 August 2009 (UTC)
Detection of very high bubble temperatures by spectral methods is limited due to the opacity of liquids to short wavelength light characteristic of very high temperatures. A study describes a method of determining temperatures based on the formation of plasmas .
Phonological opacity, a term in phonology; Semantic opacity, the opposite of semantic transparency; Opaque travel inventory, the market of selling unsold travel inventory at a discounted price; Musical works: Opacities (EP) Computer science: Measure of obscuration of background by "painting" [clarification needed] an image, e.g. alpha channel