4 letters:
lens,
cone,
foci,
type,
pair,
form,
case
5 letters:
point,
focus,
front,
image
6 letters:
points,
system,
lenses,
mirror,
design,
sphere,
ocular
7 letters:
surface,
systems,
doublet,
triplet,
glasses,
imagery,
element,
imaging
8 letters:
surfaces,
aperture,
solution,
achromat,
doublets
9 letters:
condenser,
telescope,
condition,
objective,
magnifier,
reflector,
solutions
10 letters:
condensers,
objectives,
refraction,
telescopes,
cassegrain,
correction,
components
11 letters:
combination,
illuminator
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