## I

2.2.3 The Gaussian optics approximation

Figs. 2.1 and 2.2 represent refraction effects in a plane, the plane of the paper or principal section, as a two-dimensional process. The most important aspects of the theory of centered optical systems can be dealt with in this section: the y, z plane, where z is the direction of the optical (system) axis and y the height in this section above the axis. Any light ray not lying in this section, i.e. for which the x coordinate is not always zero, is called a skew ray. We shall refer to these in Chap. 3.

In the principal section, any surface of a centered optical system can be defined, with origin at its intersection with the axis, by the equation (see

Was this article helpful?

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

Get My Free Ebook

## Post a comment