Equation (3.119) is expressed, as in Eq. (3.96) for the classical telescope, in terms of the constructional parameters f , L and d1. These relations, and all the others derived in this section, can, if preferred, be equally well expressed in terms of the parameters f1, m2 and Ra. Chap. 2 (ยง gives all the necessary conversion formulae. Here we make use of f' = m2fi (2.55)

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