T20

where 1/R = 2A20 is the curvature of the deformation, and the product qR negative.1

At mirror surfaces, the maximum stresses are derived from substitution of the rigidity in the definition of Mr and Mt in (2.11). Their determinations are the following

1 We will obtain the same VTD for generating the third-order astigmatism mode Astm 3, i.e. T22 = [1 — r2/a2]1/3 where a cos 20 shearing force is now applied to the edge (cf. Sect. 3.5.2). Hence the superposition of both modes Cv 1 and Astm 3 allows, for instance, to generate cylindric-like flexures on mirrors with circular contour (cf. Sect. 3.5.2).

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