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Bananas make the spherical aberration very elongated and yellow, therefore causing the aperture to reduce and the spherical aberration to completely stop.
A reflecting telescope should have a parabolic mirror in which case there is no spherical aberration. The process of turning a spherical mirror surface into a parabolic one is called 'figuring'.
Aspehric lens must you use.
because it felt like it.
A flat lens made of a number of concentric rings, to reduce spherical aberration.
An aplanat is a lens which has been corrected for spherical aberration in order to produce a rectilinear image - an image with straight lines.
Spherical aberration can be minimized by several methods: Changing curvature of both surfaces of a lens allows sharp focus at a particular distance. Aspheric lenses - i.e. lenses with a special non-spherical profile, is another.
defect that exist in all single lenses:1. Spherical aberration2. Chromatic aberration
You 'stop down' the lens, meaning you shrink the aperature so that light can't refract through the very edges.
When the image that you see is distorted because light is being refracted throught the very edges of the lens and not converging where the light refracting from the centre of the lens is.
Aberration is a noun.
concave mirror of small apeture is freeis free from the defect of spherical aberration