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单词 focal surface
释义

focal surface

Optics
noun
An imaginary curved (usually spherical) surface on which initially parallel rays come to a focus after passing through a lens or other optical system.
  • A focal surface with no curvature is a focal plane..

Origin

Early 19th century; earliest use found in Transactions of the Royal Irish Academy.

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更新时间:2024/11/12 10:37:48