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- Sparrows_resolution_limit abstract "Sparrow's Resolution Limit is an estimate of the angular resolution limit of an optical instrument.When a star is observed with a telescope, the light is diffracted or spread apart into an Airy disk. The resolution limit is defined as the minimum angular separation between two stars that can still be perceived as separate by an observer. The angular diameter of the Airy disk is determined by the aperture of the instrument. Rayleigh's resolution limit is reached when the two stars are separated by the theoretical radius of the first dark interval around the Airy disk, which is larger than the disk's apparent radius, so that a distinct dark gap appears between the two disks. Most astronomers say they can still distinguish the two stars when they are closer than Rayleigh's resolution limit. Sparrow's Resolution Limit is reached when the combined light from two overlapping and equally bright Airy disks is constant along a line between the central peak brightness of the two Airy disks. However, at the Sparrow resolution limit the two Airy disks will appear to be just touching at their edges, which according to Sparrow is due to a brightness contrast response of the eye. The same reasoning applies to the resolution of two wavelengths in a spectroscope, where lines of emission or absorption will have a diffraction induced width analogous to the diameter of an Airy disk. Sparrow's resolution limit is nearly equivalent to the theoretical diffraction limit of resolution, the wavelength of light divided by the aperture diameter, and about 20% smaller than the Rayleigh limit. For example, in a 200mm (eight-inch) telescope, Rayleigh's resolution limit is 0.69 arcseconds, Sparrow's resolution limit is 0.54 arcseconds. Sparrow's resolution limit was derived in 1916 from photographic experiments with simulated spectroscopic lines and is most commonly applied in spectroscopy, microscopy and photography. The Dawes resolution limit is more often used in visual double star astronomy.".
- Sparrows_resolution_limit thumbnail Airydisks_sparrow_sqrt.png?width=300.
- Sparrows_resolution_limit wikiPageID "26444049".
- Sparrows_resolution_limit wikiPageLength "2408".
- Sparrows_resolution_limit wikiPageOutDegree "6".
- Sparrows_resolution_limit wikiPageRevisionID "674514148".
- Sparrows_resolution_limit wikiPageWikiLink Airy_disk.
- Sparrows_resolution_limit wikiPageWikiLink Angular_resolution.
- Sparrows_resolution_limit wikiPageWikiLink Category:Optics.
- Sparrows_resolution_limit wikiPageWikiLink Dawes_limit.
- Sparrows_resolution_limit wikiPageWikiLink Rayleigh_criterion.
- Sparrows_resolution_limit wikiPageWikiLink File:Airydisks_sparrow_sqrt.png.
- Sparrows_resolution_limit wikiPageWikiLinkText "Sparrow's resolution limit".
- Sparrows_resolution_limit hasPhotoCollection Sparrows_resolution_limit.
- Sparrows_resolution_limit subject Category:Optics.
- Sparrows_resolution_limit hypernym Estimate.
- Sparrows_resolution_limit comment "Sparrow's Resolution Limit is an estimate of the angular resolution limit of an optical instrument.When a star is observed with a telescope, the light is diffracted or spread apart into an Airy disk. The resolution limit is defined as the minimum angular separation between two stars that can still be perceived as separate by an observer. The angular diameter of the Airy disk is determined by the aperture of the instrument.".
- Sparrows_resolution_limit label "Sparrow's resolution limit".
- Sparrows_resolution_limit sameAs m.0bbzrfl.
- Sparrows_resolution_limit sameAs Q7573751.
- Sparrows_resolution_limit sameAs Q7573751.
- Sparrows_resolution_limit wasDerivedFrom Sparrows_resolution_limitoldid=674514148.
- Sparrows_resolution_limit depiction Airydisks_sparrow_sqrt.png.
- Sparrows_resolution_limit isPrimaryTopicOf Sparrows_resolution_limit.
