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


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 ?
Most state reciprocity laws expressly allow wineries and consumers to avoid the excise tax.
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.
The spread of reciprocity laws has greatly eased restrictions on law-abiding citizens who travel with their firearms.
The potential impact of both the additivity and reciprocity laws on the polymeric materials community is tremendous.
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.