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English-Thai Dictionary

aplanatic

A ไม่มี การ เปลี่ยน ของ สี mai-mi-kan-plian-kong-si

Webster's 1828 Dictionary

APLANATIC

a.[Gr. to wander. ] An aplanatic telescope is one which entirely corrects the aberration of the rays of light. It is thus distinguished from the achromatic, which only partially corrects the aberration.

Webster's 1913 Dictionary

APLANATIC

Ap `la *nat "ic, a. Etym: [Gr. (Opt. )

Defn: Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. Aplanatic focus of a lens (Opt. ), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed.