D

Effective diameter (aperture) of a system; diameter of the entrance pupil

ยง 2.2.6

(Dax )2

Axial beam diameter of M2 in a 2-mirror telescope

Eq. (2.93)

(DtOt) 2

Full diameter of M2 in a 2-mirror telescope

Eq. (2.93)

d

Axial distance between a given surface of a system and the next surface (see surface number v)

Fig. 2.11, Fig. 2.12, Eq. (2.37)

E, E'

Entrance, exit pupil of a system

Fig. 2.6

F, F'

Object, image focal point of a system

Fig. 2.1, Fig. 2.2

f, f'

Object-side, image-side focal length of a system

Fig. 2.1, Fig. 2.2

Symbol

Meaning

Where defined

fl , f2

Image-side focal lengths of Mi, M2 in a 2-mirror telescope

Eqs. (2.54), (2.55), (2.60)

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