What is the difference between spherical aberration and chromatic aberration?

Answer 1

Spherical aberration:
In optics, spherical aberration is an image imperfection that occurs due to the increased refraction of light rays that occurs when rays strike a lens or a reflection of light rays that occurs when rays strike a mirror near its edge, in comparison with those that strike nearer the center. 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, as spherical shapes are much easier to produce than aspherical and so most lenses have spherical shapes.

The effect is proportional to the fourth power of the diameter and inversely proportional to the third power of the focal length, so it is much more pronounced at short focal ratios, i.e., "fast" lenses.

Chromatic aberration:
In optics, chromatic aberration is caused by a lens having a different refractive index for different wavelengths of light (the dispersion of the lens). The term "purple fringing" is commonly used in photography, although not all purple fringing can be attributed to chromatic aberration.

Longitudinal and lateral chromatic aberration of a lens is seen as "fringes" of color around the image, because each color in the optical spectrum cannot be focused at a single common point on the optical axis.

Since the focal length f of a lens is dependent on the refractive index n, different wavelengths of light will be focused on different positions. Chromatic aberration can be both longitudinal, in that different wavelengths are focused at a different distance from the lens; and transverse or lateral, in that different wavelengths are focused at different positions in the focal plane (because the magnification of the lens also varies with wavelength).

Answer 2

Spherical aberration-When light passes through the edge of a lens focusing a slightly different place from where the light passes through the center of the lens, Having many focal point produces a blurry image. It s also known as "light bending" Spherical aberration depends of the focal length, aperture,shape and the distance from the object to the axis

Chromatic aberration-when the lens can t focus different colors in the same place because of the focal length, it depends on the refraction.
Glasses of different dispersion are use to minimize chromatic aberration.
There are two type of dispersion glass;crown and flint.

Answer 3

What Is Spherical Aberration

Answer 4

Spherical... the shape is changed
Chromatic... the color is changed

Answer 5

TRy this article and the links inside

http://en.wikipedia.org/wiki/Aberration_in_optical_systems