corneal lens lens

corneal lens（lenses） lens

Lens-to-lens interval

object lens objective lens

objective lens object lens

plane-concave lens (=plano-concave lens)

plane-convex lens (=plano lens)

short focal length lens (=short-focus lens)

variable focus lens vari-focus lens

vari-focus lens variable focus lens

2-chromatic number

2-distance chromatic number

3-chromatic number

3—Chromatic Number

acyclic edge chromatic index

acyclic edge chromatic number

Adjacent strong edge chromatic number

adjacent vertex distinguishable VE-total chromatic

adjacent vertex distinguishing total chromatic num