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François Arago
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Dominique François Jean Arago, known simply as François Arago, was a French mathematician, physicist, astronomer, freemason, supporter of the Carbonari revolutionaries, and politician.
Portrait by Charles de Steuben, 1832
Portrait by Charles de Steuben, 1832
Charles Babbage, Account of the repetition of M. Arago's experiments on the magnetism manifested by various substances during the act of rotation, 182
Charles Babbage, Account of the repetition of M. Arago's experiments on the magnetism manifested by various substances during the act of rotation, 1825
François Arago
François Arago
One of the 135 Arago medallions set along the Paris Meridian for 9.2 km (6 mi), in memorial to Arago and his work on the meridian and his measurements
One of the 135 Arago medallions set along the Paris Meridian for 9.2 km (6 mi), in memorial to Arago and his work on the meridian and his measurements of the Earth.
Arago spot
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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. This spot played an important role in th
François Arago
…freemason, supporter of the Carbonari revolutionaries, and politician. In physics, he is known for helping establishing the wave theory of light. The Arago spot, an important experiment in optics that demonstrated this phenomenon, is named after him. Arago was born at Estagel, a small village of 3,000 near…
Notation for calculating the wave amplitude at point P1 from a spherical point source at P0.
Notation for calculating the wave amplitude at point P1 from a spherical point source at P0.
The on-axis intensity at the center of the shadow of a small circular obstacle converges to the unobstructed intensity.
The on-axis intensity at the center of the shadow of a small circular obstacle converges to the unobstructed intensity.
Numerical simulation of the intensity of monochromatic light of wavelength λ = 0.5 μm behind a circular obstacle of radius R = 5 μm = 10λ.
Numerical simulation of the intensity of monochromatic light of wavelength λ = 0.5 μm behind a circular obstacle of radius R = 5 μm = 10λ.
Arago spot experiment. A point source illuminates a circular object, casting a shadow on a screen. At the shadow's center a bright spot appears due to
Arago spot experiment. A point source illuminates a circular object, casting a shadow on a screen. At the shadow's center a bright spot appears due to diffraction, contradicting the prediction of geometric optics.