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Running Head: OPTICS DISCUSSION
What are the various types of optical aberrations?
Optical aberration refers to errors in the image generated by an optical system. There are
six types of optical aberrations, namely; astigmatism, chromatic aberration, coma, distortion,
field curvature and spherical aberration (Erni, 2010).
How do the different types of aberrations effect images?
Astigmatism causes rays of light entering the optical system in either horizontal or
vertical plane to form an ellipse instead of forming a neat focal point with the consequence that
an illusion of directional blur results (Erni, 2010). For rays lying in two orthogonal planes on the
optical axis, astigmatism causes a blur in one direction that is absent in the other direction if the
rays have different foci. On the other hand, chromatic aberration affects images by causing color
fringes to appear across images, consequently leading to the formation of blurred edges that
make it impossible to correctly image object features. Coma affects the image by making the
object plane to appear as a comet-shaped element in the image (Erni, 2010). Distortion affects
the image by making the image to appear as though it is wrapped around a sphere. On another
hand, field curvature affects the image by causing radial defocusing which results in only a
circular crown of the object to be in focus (Erni, 2010). Lastly, spherical aberration causes an
overall loss of focus that is characterized with a blurring effect towards the edge of the optical
What are some ways that aberrations are corrected?
Spherical aberrations can be reduced by using aspherical lens. Spherical aberration can
also be corrected by placing an aperture in front of the lens. Chromatic aberration can be
corrected by either using an achromatic doublet or a monochrome light...
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