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.
- all-star game
- all-star team
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- all-talk
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- all-terrain bike
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