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*TILT/DECENTER DATA 6 DT 1 DCX — DCY — DCZ —BEN TLA 45.000000 TLB — TLC — *SURFACE TAG DATA 6 TIR 1 The next step will be to add a turning mirror that reflects the beam so that it continues from left to right.

Note that an axial ray height solve is used on surface 8, even though the system has tilted elements. In the case where only tilts of plane surfaces are used, and the bend flag is used to propagate the optical axis, paraxial optics remains valid. It is interesting to investigate the TIR condition vs. the refractive index of the prism. For this purpose, use Update >> Operating Conditions >> Lens Drawings to set the number of default rays traced to 11. Then change the glass used for the prism to one with a lower index, say BK7. Note that several rays in the lower aperture now fail because they are not totally internally reflected.