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I've done some ray tracing of my own and, not surprisingly, got the same results.
I also explored the possibility of a null test, for back reflection from R2 through R1 and for autocollimation with a flat. I could not get a good enough null for either setup with a simple null lens.
Looks like I have to make the test plate for R2 and leave the figuring of R1 last, as a complete instrument in autocollimation.
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