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    Re: Back sights, a working Virtual Octant
    From: Bill Noyce
    Date: 2010 Apr 2, 14:03 -0700

    Brad Morris writes:

    > I will probably go ahead and generate one for the case where the
    > optical path for each horizon mirror strikes the index mirror in
    > the same location. That will be just a bit trickier, because if
    > we move the mirror in X,Y we must also change the angle. I wonder
    > if that should be automatically done...
    > Best Regards
    > Brad

    No, you can't change the angle -- the two horizon mirros must remain perpendicular to each other. What you *can* change is the angle of the incident ray from the eye. Or, to look at it another way, first lay out the light path between the two mirrors. Then allow the reflected ray to the eye, and the reflected ray to the observed body, to fall wherever the laws of reflection send them.
    -- Bill N.
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