: 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
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“Ricco's law.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Ricco%27s%20law. Accessed 24 Nov. 2024.
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