P

The distance between the primary and secondary image in a 2-mirror telescope

Fig. 2.11, Fig. 2.12, Eq. (2.81), Eq. (2.84)

p (suffix)

Denotes a field ray, or property thereof, which cuts the axis at P or P'

Fig. 2.5, Fig. 2.6

pr (suffix)

Denotes a principal ray, or property thereof, which cuts the axis at E and E'

Fig. 2.6, Fig. 2.8

Ra

Axial obstruction ratio of a 2-mirror telescope

Eq. (2.58), Eq. (2.72)

r

Radius of curvature of a surface = 1/c (see surface number v)

Eq. (2.13), Eq. (2.36)

Symbol

Meaning

Where defined

ri, r2 •••

Defined light rays

Figs. 2.1, 2.2, 2.4, 2.6, 2.8

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