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Please, when 'doing' ray diagrams, include MORE rays than the
requisite 'principal' rays.
The principal rays are only 'special' because we can do the geometry
with them easily.
I think that it is important to emphasize that ALL rays that share
the same origin as the principal rays do - will end up at the same
point as do all of the principle rays.
It's awful easy to JUST do the principle rays - and this sometimes
makes these rays seem overly 'special' or somehow the 'only' rays
that behave in this manner.