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WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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Arago spot
Videos
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
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.
Wave–particle duality
Videos
Wave–particle duality is the concept in quantum mechanics that fundamental entities of the universe, like photons and electrons, exhibit particle or wave properties according to the experimental circu
Arago spot
…point that appears at the center of a circular object's shadow due to Fresnel diffraction. This spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave. The basic experimental setup requires a point source, such as an illuminated…
Left half: schematic setup for electron double-slit experiment with masking; inset micrographs of slits and mask; Right half: results for slit 1, slit
Left half: schematic setup for electron double-slit experiment with masking; inset micrographs of slits and mask; Right half: results for slit 1, slit 2 and both slits open.
Interferometer schematic diagram
Interferometer schematic diagram