These equations apply to both the paraxial aperture and principal rays. Starting with spri and upri, they then give the field parameters yprv and Av in
Eqs. (3.20). If the object is at a finite distance si and the aperture ray has the angle u1 to the axis, then the formulae give the aperture parameters yv, and . '
For a 4-mirror telescope, (3.333) gives:
yi y2 ya y4
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