The Lagrange Invariant

Fig. 2.5, Eq. (2.27)

H (suffix)

Upper ray

Fig. 2.1, Fig. 2.2

I, I'

Axial object, image positions of a system

Fig. 2.2

Ih , IH

Object, image positions associated with an upper ray

Fig. 2.2, Fig. 2.5

Il, I'll

Object, image positions associated with a lower ray

Fig. 2.8

h, I2

Primary and secondary axial image points in a 2-mirror telescope

Fig. 2.11, Fig. 2.12

i, i'

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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