What does spherical aberration mean?
Definitions for spherical aberration
This dictionary definitions page includes all the possible meanings, example usage and translations of the word spherical aberration.
an optical aberration resulting in a distorted image
A type of lens aberration which causes blurriness, particularly away from the centre of the lens.
In optics, spherical aberration (SA) is a type of aberration found in optical systems that have elements with spherical surfaces. Lenses and curved mirrors are prime examples, because this shape is easier to manufacture. Light rays that strike a spherical surface off-centre are refracted or reflected more or less than those that strike close to the centre. This deviation reduces the quality of images produced by optical systems. The effect of spherical aberration was first identified by Ibn al-Haytham who discussed it in his work Kitāb al-Manāẓir.
Spherical aberration is an optical effect observed in an optical device that occurs due to the increased refraction of light rays when they strike a lens or a reflection of light rays when they strike a mirror near its edge, in comparison with those that strike nearer the centre. It signifies a deviation of the device from the norm, i.e., it results in an imperfection of the produced image. A spherical lens has an aplanatic point only at a radius that equals the radius of the sphere divided by the index of refraction of the lens material. A typical value of refractive index for crown glass is 1.5, which indicates that only about 43% of the area of a spherical lens is useful. It is often considered to be an imperfection of telescopes and other instruments which makes their focusing less than ideal due to the spherical shape of lenses and mirrors. This is an important effect, because spherical shapes are much easier to produce than aspherical ones. In many cases, it is cheaper to use multiple spherical elements to compensate for spherical aberration than it is to use a single aspheric lens. "Positive" spherical aberration means peripheral rays are bent too much. "Negative" spherical aberration means peripheral rays are not bent enough.
The numerical value of spherical aberration in Chaldean Numerology is: 7
The numerical value of spherical aberration in Pythagorean Numerology is: 5
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"spherical aberration." Definitions.net. STANDS4 LLC, 2023. Web. 2 Jun 2023. <https://www.definitions.net/definition/spherical+aberration>.
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