N

Relative aperture, f/no

Eq. (2.104)

n, n'

Refractive index in the object, image space of a refracting or reflecting surface (see surface number v)

Fig. 2.2 Eq. (2.11), Eq. (2.12)

P, P'

Object-side, image-side principal points of a system

Fig. 2.1, Fig. 2.2

Ph , P'h

Object-side, image-side upper ray points defining with P, P' the principal planes of a system

Fig. 2.1, Fig. 2.2

Pl, PL

Object-side, image-side lower ray points defining with P, P' the principal planes of a system

Fig. 2.2

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