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单词 focal surface
释义

Definition of focal surface in English:

focal surface

noun
  • 1Geometry a surface formed by the centres of curvature of a surface.

  • 2Optics an imaginary curved (usually spherical) surface on which initially parallel rays come to a focus after passing through a given lens or other optical system, and on which (in the case of visible light) the images of distant objects would be formed.

Origin

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

 
 

Definition of focal surface in US English:

focal surface

noun
  • 1Geometry a surface formed by the centres of curvature of a surface.

  • 2Optics an imaginary curved (usually spherical) surface on which initially parallel rays come to a focus after passing through a given lens or other optical system, and on which (in the case of visible light) the images of distant objects would be formed.

Origin

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

 
 
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更新时间:2024/12/23 14:21:53