Info

Sphe3

64R3

Tri5

= a4 _k2u2[1 + 5k_ k(6 + 5k)u2] 42 = 16R3 (1 _ ku2)7/2

Astm5

These coefficients allow one to determine the convenient linear segment number and global mirror f-ratio, (N, Q), by making several modes of the marginal segments negligible such as, for instance, the sag O40 of the Sphe 3 mode. Hence this provides important simplifications in the stress figuring process and allows the execution of a hyperboloid or an elongated ellipsoid whose global sag may substantially deviate from that of a paraboloid.

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