Reciprocity law

reciprocity law --> Bunsen-Roscoe law

In two photochemical reactions, e.g., the darkening of a photographic plate or film, 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; the retina for short periods of exposure obeys this law.

Synonym: reciprocity law, roscoe-Bunsen law.

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