Ricco's law

Ricco's law
Ric·co's law 'rik-ōz- n a statement in physiology: when a light source of a given size and intensity is just capable of producing visual sensation, reduction of either size or intensity will make it invisible
Ric·cò rēk-'kō Annibale (1844-1919)
Italian astrophysicist. A professor of astrophysics, Riccò founded an astronomical and meteorological station on Mt. Etna. For over forty years, he conducted a regular series of direct and spectroscopic observations of the sun, accumulating data on the frequency, position, and development of sunspots and clouds of solar gases and on their influence on terrestrial phenomena. Also interested in geodesy and geophysics, he made measurements in Sicily of the local values of the earth's gravitational and magnetic fields.

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for small images, the product of the area of illumination and the intensity of illumination is constant for the threshold of detection of a light stimulus, expressed by the formula LA=C, where L is the threshold intensity, A is the area of illumination, and C is a constant.

Medical dictionary. 2011.

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