In optics, the Arago spot, Poisson spot, or Fresnel spot is a bright point that appears at the center of a circular object's shadow due to Fresnel diffraction...

François Jean Arago (Catalan: Domènec Francesc Joan Aragó), known simply as François Arago (French: [fʁɑ̃swa aʁaɡo]; Catalan: Francesc Aragó, IPA: [fɾənˈsɛsk...

Arago may refer to: Aragó, a family name of the kings of the Aragonese Crown Étienne Arago (1802–1892), French journalist, theater director, and politician;...

thermodynamics, elasticity, and fluid mechanics. Moreover, he predicted the Arago spot in his attempt to disprove the wave theory of Augustin-Jean Fresnel. Poisson...

in his honor. The zone plate's focusing ability is an extension of the Arago spot phenomenon caused by diffraction from an opaque disc. A zone plate consists...

Fresnel diffraction showing central Arago spot...

heard of again till the 20th century. Arago later noted that the phenomenon (which is sometimes called the Arago spot) had already been observed by Joseph-Nicolas...

bright spot in the center of the shadow, illuminated as brightly as the exterior. This seems to have been intended as a reductio ad absurdum. Arago, undeterred...

Arago telescope (Lunette Arago) is a 38 cm (15 inch) aperture refracting telescope at Paris Observatory, installed in 1857. Francois Arago ordered this...

{\displaystyle J_{1}} is a Bessel function. The smaller the aperture, the larger the spot size at a given distance, and the greater the divergence of the diffracted...

incidence Angle of reflection Angular magnification Anti-reflective coating Arago spot Asterism (astronomy) Asterism (gemmology) Aspheric lens Atmospheric diffraction...

An experiment by François Arago showed the existence of this effect, now called the Arago spot, or "Poisson's bright spot", which led to the acceptance...

By the mid-1800s, various experiments such as the observation of the Arago spot and differential measurements of the speed of light in air versus water...

and meteorites. Giacomo F. Maraldi makes the first observation of the Arago spot, unrecognized at this time. January 5 – Nicole-Reine Lepaute, French astronomer...

experiment Thomas Young Confirmation Wave theory of light 1819 Arago spot experiment François Arago Confirmation Fresnel diffraction due to circular object 1838...

particle-versus-wave nature of light. Although the observation of the Arago spot in 1819 may have seemed to settle the matter definitively in favor of...

a wave in his double-slit experiment. Arago spot (1819): Observation of circular diffraction by François Arago, validated a new wave theory of light by...

to modern quantum mechanical treatments. The 1819 observation of the Arago spot (a bright point at the center of a circular object's shadow due to diffraction)...

reflection – Alexander F. Andreev Apgar score – Virginia Apgar Arago spot – Dominique François Jean Arago Michaelis–Arbuzov reaction – Aleksandr Erminingeldovich...

Apache Arrowhead Apache Point Observatory Lunar Laser-ranging Operation Arago spot Argon fluoride laser Argus laser Asterix IV laser Astrophysical maser...

physics Applied spectroscopy Apse line Apsidal precession Apsis ArDM ArXiv Arago spot Arbitrary unit Arc suppression Archeops Archer's paradox Archibald Hill...

293° ± 3° rate= 75 ±15 mm/yr Arago hotspot (Arago Seamount, 59) 23°24′S 150°42′W / 23.4°S 150.7°W / -23.4; -150.7 (Arago hotspot), w= 1 azim= 296° ±4°...

prediction of the existence of this spot. It is also called the Arago spot as François Arago observed it or the Fresnel bright spot after Augustin-Jean Fresnel's...

Giacomo Filippo Maraldi. In the next year he discovered the Arago spot a century before Arago. Though he was a good scientist and member of a wealthy family...

Arago cave is a prehistoric site in the community of Tautavel, in the department of Pyrénées-Orientales. It is a large cavity overlooking a perennial...

Arago hotspot (also known as the Rurutu hotspot, Young Rurutu hotspot or Atiu hotspot) is a hotspot in the Pacific Ocean, presently located below the...

resolution at visible wavelengths using near-field optical techniques. Arago spot Near and far field, the general principle in electromagnetism Ohtsu, Motoichi...

Poisson's spot, an observation that was unrecognized until its rediscovery in the early 19th century by Dominique Arago. At the time of Arago's discovery...

However its base volcano was a hot spot volcano that erupted 9·39 million years ago in expected time sequence in the Arago hotspot series of volcanoes. Aitutaki...

and he had loyal support in this from the observatory director, François Arago. This suggestion met with stiff resistance outside France. French almanacs...