Answer | Crossword Clue |
---|---|
aplanatism | freedom from spherical aberration |
aplanatisms | APLANATISM, freedom from spherical aberration |
apochromatic | free from chromatic and spherical aberration |
aplanatic | of a lens, free of spherical aberration |
aplanatically | APLANATIC, of a lens, free of spherical aberration |
fresnels | A flat lens made of a number of concentric rings, to reduce spherical aberration |