Fig. 27.

Schematic and simplified illustration of the polarimetric beam shift effects for the M3 Nasmyth mirror. The incoming beam and the expected reflection according to geometric optics are plotted in black. The beam and wavefront displacements for I⊥ and I∥ caused by the phase shifts, with the corresponding “effective” mirror surface location and tilts, are hugely exaggerated and drawn in red and blue respectively.
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