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Now fmen is, in Eq. (3.271), the determinant parameter for the spherical aberration of a thin lens, for given values of y1, n' and shape determined by r1. If we give the real, thick meniscus the same focal length, we have, within the approximation defined, the condition for setting its aberration to compensate that of the primary mirror. From Table 3.4 and Eq. (3.21), the third order spherical aberration of the spherical mirror M1 is given by

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