The Lagrange Invariant
Fig. 2.5, Eq. (2.27)
Fig. 2.1, Fig. 2.2
Axial object, image positions of a system
Ih , IH
Object, image positions associated with an upper ray
Fig. 2.2, Fig. 2.5
Object, image positions associated with a lower ray
Primary and secondary axial image points in a 2-mirror telescope
Fig. 2.11, Fig. 2.12
Ray incident angles to a surface before, after refraction or reflection (see surface number v)
Eq. (2.15), Eq. (2.36)
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