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| physical object > artifact > device > instrument > optical device > wavefront modifier > lens > aplanatic system | 
| aplanatic system comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| lens | wavefront modifier | |
| aplanatic system | lens | A system of three lenses which, taken together, correct for spherical aberration, chromatic aberration, and coma. | 
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