Abbe number, a measure of the material's optical dispersion
Abbe prism, a type of constant deviation dispersive prism similar to a Pellin–Broca prism
Abbe refractometer, a bench-top refractometer that offers the highest precision of the different types of refractometers
Abbe sine condition, a condition that must be fulfilled by a lens or other optical system in order for it to produce sharp images of off-axis as well as on-axis objects
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