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physical object > artifact > device > instrument > optical device > wavefront modifier > lens > achromatic lens > achromatic objective
Upachromatic lens

achromatic objective comparison table
Subject is a kind of has definition
achromatic lenslensLens (or combination of lenses) that brings different wavelenghts within a ray of light to a single focus, thus overcoming chromatic aberration. It was first successfully made by Joseph von Fraunhofer.
achromatic objectiveachromatic lensA lens of two or more components with different refraction indices (e.g., crown glass and flint glass), used to correct for chromatic aberration.

Upachromatic lens