T

True telephoto effect of a 2-mirror telescope relative to the length L

Eq. (2.57)

TP

Telephoto effect of a 2-mirror telescope relative to the primary focal length f[

Eq. (2.56)

t

Time (light propagation)

Eq. (2.11)

u, u'

Ray angles to the axis before, after refraction or reflection (see surface number v)

Fig. 2.5, Eq. (2.26)

W, W '

Wavefront (or wavefront aberration) before, after refraction or reflection

Fig. 2.3

x, y, z

Cartesian coordinate system (right-hand set): z is the axial distance, y the height in the principal section

§ 2.2.1, § 2.2.3, Eq. (2.13)

x', y', zZ

Coordinates after refraction or reflection

§ 2.2.1, § 2.2.3, Eq. (2.13)

Symbol

Meaning

Where defined

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