comment, note that the spherical aberration is zero when m = —I. For this
magnification s = s\ and the sphere is the perfect surface according to Fermat's
Principle.
4.2.d. DISTRIBUTION OF RAYS NEAR FOCUS
As given by the preceding relations, TSA is a measure of the image size of a
point object at the paraxial focus. The distribution of
rays
near the paraxial focus
is such that the image has a minimum size between paraxial focus and the focus
for marginal rays. Here we consider the ray distribution as seen in cross section,
both along and perpendicular to the optical axis.
A cross section of the image along the z-axi ...
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