focal length; object (image) distance for image (object) at infinity
focal ratio
object (image) height
Lagrange invariant
angle of incidence (refi-action)
transverse magnification
angular magnification
index of refraction in space with incident (refi*acted) ray
power of surface or optical system
radius of curvature at vertex of surface
object (image) distance
telescope scale
slope angle of ray before (after) refi-action
distance fi'om stop to surface
coordinate direction along axis of optical system
normalized distance fi-om exit pupil to telescope focus
displacemen ...
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