reciprocity law

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Bun·sen-Ros·coe law

(bŭn'sĕn ros'kō),
in two photochemical reactions, for example, the darkening of a photographic plate or film, if the products of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will also be equal; the retina for short periods of exposure obeys this law.

reciprocity law

Any milliamperage multiplied by an exposure time setting that gives the same milliamperage-second outcome should give the same relative density to an image. However, this law is dramatically affected by the image receptor response curve, esp. when it is not a 45° linear curve. In radiographic intensifying film and screen technologies, the reciprocity law does not hold at long exposure times because of the reversal of the D log E response curve.
See also: law

Bunsen,

Robert W., German chemist and physicist, 1811-1899.
Bunsen burner - a gas lamp giving a very hot but only slightly luminous flame.
Bunsen solubility coefficient - the milliliters of gas STPD dissolved per milliliter of liquid and per atmosphere (760 mmHg) partial pressure of the gas at any given temperature.
Bunsen-Roscoe law - in two photochemical reactions, if the product of the intensity of illumination and the time of exposure are equal, the quantities of chemical material undergoing change will be equal. Synonym(s): reciprocity law; Roscoe-Bunsen law
Roscoe-Bunsen law - Synonym(s): Bunsen-Roscoe law
References in periodicals archive ?
A law enabling foreign citizens to buy property in Turkey -- known as the reciprocity law -- came into force last year after passing through Parliament and the Cabinet.
According to the reciprocity law, the citizens of some countries can purchase property in Turkey unconditionally while there are restrictions on qualifying to buy property for citizens of 31 countries.
We may need another three to five years for the reciprocity law to mature with new updates such as lifting restrictions on residence permits for more buyers," he told Today's Zaman.
A few years later, Schwarzschild, an astronomer, proposed a modification of the reciprocity law that fit his low intensity, stellar data.
Note that when p = 1, the Schwarzschild law and the reciprocity law are identical; hence, the Schwarzchild's law is a generalization of the reciprocity law.
One of the first experiments to be carried out on the SPHERE was to ascertain the relationship between the UV irradiance and the photoresponse of a polymeric system, and to subsequently determine whether the reciprocity law is valid for this particular material.
Most state reciprocity laws expressly allow wineries and consumers to avoid the excise tax.
The more recent flavors of reciprocity laws DO NOT generally authorize direct mail solicitation and sales programs.
In an extremely liberal interpretation of California's reciprocity law, the California ABC eventually ruled that Oregon's law was substantially reciprocal.
With the concepts of generalized reciprocity laws as the endpoint, the text describes the definitions and constructions in modern algebra and number theory, the notion of representation, solving Diophantine equations, Galois theory, elliptic curves, matrices, groups of matrices and representation of groups.
Since the 1986 passage in California of the original reciprocity legislation, the Wine Institute says that 12 states have adopted reciprocity laws.
He starts by covering the classical theorems, then describes the integral domain of rational integers, Euclidean domains, rings of polynomials and former power series, the Chinese remainder theorem and the evaluation of a number of solutions of a linear congruence with side conditions, reciprocity laws, and finite groups.