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E. Rosotte after Ambroise Tardieu, portrait of Augustin Fresnel, in Oeuvres completes d'Augustin Fresnel, tome 1 (Paris, 1866), public domain · Frontispiece engraving of Augustin Fresnel signed 'E. Rosotte sculp. d'apres A. Tardieu' in the official edition 'Oeuvres completes d'Augustin Fresnel', tome 1 (Paris: Imprimerie imperiale, 1866), in the Internet Archive copy digitised from the New York Public Library (page image 2500 x 3275). The engraving is a later print after a portrait by Ambroise Tardieu; none of the sources read documents a sitting, so it is not presented as a likeness. This file is the engraving only, cropped from the scan and downscaled to 1058 x 1200 with no upscaling. · Public domain: published in Paris in 1866 (before 1931); the portrait it copies is by an artist who died in 1841
physicist · 19th Century
Augustin-Jean Fresnel
1788–1827
Known For
scientificengineeringinnovation
Not yet included in personality matching — the documented evidence doesn't yet cover enough of the personality model. Everything else on this page is fully available.
Trait Constellation
Key Achievements
His diffraction and interference experiments and his mathematics of wavelets helped establish the wave theory of light at a time when most scientists favoured the particle theory, and he concluded that light is a transverse wave.
His 1819 diffraction memoir won the Academy of Sciences prize; Poisson's calculation from its mathematics predicted a bright spot at the centre of a disk's shadow, which was then observed.
He developed stepped lenses for lighthouses, with the first built at the Cordouan tower in 1823, replacing mirrors; the Fresnel lens is still widely used.
Moments That Reveal Them
He attached a piece of black paper to one edge of a diffracting object, saw the bright bands inside the shadow disappear, and deduced which bands came from light from both edges.
This is consistent with testing an idea by changing one condition in a hands-on experiment. Experimentation
In 1821 he asserted with certainty that light is a transverse wave, a step too far for most colleagues (Arago among them), and then showed that double refraction followed from the idea.
This is consistent with holding to a minority conclusion that his own reasoning supported. Independent Thinking
Turning Points
In mid-1814, while building roads as a government engineer, he began experiments on light, and a few months after writing that he did not know what polarisation of light was he was among the leading physicists of his day.
This is consistent with taking up a new field through his own experiments alongside paid work. Experimentation
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Sources
- Augustin-Jean Fresnel (Q187241), verified live via the Wikidata API (2026-11-04): English label 'Augustin-Jean Fresnel', description 'French engineer and physicist (1788-1827)', Korean label 오귀스탱 장 프레넬, birth 10 May 1788 and death 14 July 1827, image the frontispiece of the 1866 Oeuvres completes. Orientation only; not used as support for any row.
- Encyclopaedia Britannica, 'Augustin-Jean Fresnel' (article body read from the public page) and the Britannica article 'Fresnel lens' (read). CANONICAL SIGNIFICANCE SOURCE: French physicist (1788-1827) who significantly contributed to optics and helped establish the wave theory of light that Thomas Young advanced; he began optics research in 1814 while working as an engineer building roads, his experiments with interference fringes and diffraction led him to the wave theory, in 1819 he presented his diffraction work to the French Academy of Sciences, where his model predicted a bright spot at the centre of a shadow, later observed and named Poisson's spot; he combined Young's interference principle with Huygens' construction; the Fresnel lens, which divides a lens into concentric rings to reduce weight, was adopted by him in 1821 for lighthouses (the idea of dividing a lens into rings having come from Buffon in 1748). Some dates in the Q&A-style summary of the biography page (for example the year of the transverse-wave conclusion) differ from MacTutor and were not used. Scholarly reference; its praise is retrospective.
- MacTutor History of Mathematics (University of St Andrews), 'Augustin Fresnel' by J. J. O'Connor and E. F. Robertson (full biography read, including its quotations from the Dictionary of Scientific Biography). Covers the engineering career, the start of his light experiments in 1814, the black-paper diffraction experiment, the 1815-16 papers, the two-mirror interference experiments, the 1819 Academy prize judged by a committee not well disposed to the wave theory (Poisson's bright spot, tested at Arago's request), the 1821 claim that light is a transverse wave which even Arago did not accept, double refraction, the Lighthouse Commission and compound lenses, election to the Academy in 1823 and the Rumford Medal in 1827, and the Dictionary of Scientific Biography's character summary (attentive to detail, systematic, thorough; tenacious in convictions; rankling self-righteousness at times). Scholarly history site; his political episodes, family and health are not used.
- Francois Arago, biographical memoir of Fresnel (read at the Academy of Sciences in 1830), in the English translation by Baden Powell in 'Biographies of Distinguished Scientific Men' (London, 1859; Internet Archive text; read: the early optical researches, the passage on never publishing without checking earlier work, the engineering duties, the lighthouse lenses and the concentric-wick lamp, the Cordouan light built in July 1823, the costs of his instruments, and the translator's notes quoting Fresnel's own acknowledgement of Young's priority and Whewell's account of the transverse-vibration memoir). Written by Fresnel's close friend and collaborator, so admiring; the memoir's political passages and the translator's long optical notes were not used.
- Robert Moon, 'Fresnel and His Followers: A Criticism' (Cambridge, 1849; Internet Archive text; preface and contents read). A hostile 19th-century Cambridge mathematician who calls Fresnel's theory 'absurd', says its hypotheses were accepted with 'not a shadow of evidence' and condemns the whole system of investigation. COUNTER-VOICE on his method of theory-building; his critique concerns the physics, not Fresnel's conduct, and later physics did not follow it (the wave theory prevailed, as Britannica and MacTutor report). The body of the book was not read.