F f TO2 f 2 f

(m2 + 1)(m2 — 1)_ Combining this with (3.299) gives with Ra = 1/3 m-2 = 1 + Ra = 2

(m2 + 1)(m2 — 1) = 2 =3 This leads to the equation

for the value of the secondary magnification m2, whose solution is, taking the negative root for the Cassegrain case, m2 = —2.0 (3.305)

Since f' = f '/m2 and spi = +2/', we now have the following parameters for calculating the third order aberrations for the normalization f' = 1.0 :

Spherical mirrors give from Eqs. (3.30) and (3.41) with bs 1 = bs2 = 0

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