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I have been following this discussion of ray tracing with interest. I
only use ray diagrams roughly to scale for students to approximately
locate images as a check on calculations, and as a means to understand
the general pattern of images for concave & convex lenses and mirrors.
I do not use them with multiple lens systems as are being discussed
since I can see no easy way to produce the needed rays for the 2nd
optical element to make quick and simple ray diagrams possible. All of
the calculations and discussions so far confirms that I do not want to
do multiple lens/mirror ray diagrams. For those systems calculations
will suffice. If anyone knows an easy way to do this that students can
do fairly quickly, I would like to see it.
James Mackey