Francesco Maria Grimaldi (April 2, 1618 – December 28, 1663) was an Italian mathematician and physicist who taught at the Jesuit college in Bologna. He was the first to make accurate observations on the diffraction of light.
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- Lumen propagatur seu diffunditur non solum Directe, Refracte, ac Reflexe, sed etiam alio quodam quarto modo, Diffracte.
- Light propagates and spreads not only directly, through refraction, and reflection, but also by a fourth mode, diffraction.
- Physico-mathesis de lumine, coloribus, et iride, aliisque adnexis libri duo: opus posthumum, published in Bologna (1665), [Proposition I].
- Lumen aliquando per sui communicationem reddit obscuriorem superficiem corporis aliunde, ac prius illustratam.
- Occasionally, light added to itself may give obscure surfaces on a body that has already received light.
- also translated as "A body actually enlightened may become obscure by adding new light to that which it has already received." in The Penny cyclopaedia (1845), [p. 668].
- First account of an interference effect in Physico-mathesis de lumine, coloribus, et iride, aliisque adnexis libri duo: opus posthumum, published in Bologna (1665), [Proposition XXII].