Bunsen-Roscoe law[bŭn′sĕn ros′kō]


1. in two photochemical reactions, 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 , Roscoe-Bunsen law

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