> If an image
> is in focus then all light coming from a single point on the source of
that
> image must come together on one single point on the focusing screen even
> when they travel different paths through the lens (f.i. one ray through
the
> left part of a lens and an other through the right part). A split image is
a
> small prism where the top part looks at those rays coming from the left
and
> the bottom part looks only at parts coming from the right (or the other
way
> round). If an image is off focus then these two images come together just
> behind or in front of the focus screen. In that case the two half images
> show a slightly different view and thus do not allign.
Okay, I think I see what you're getting at, but I definitely need to draw
something on paper to make sure I understand.. Now I've got something to
start with, though, which is a big improvement over where I was before.
thanks!
-- dan
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