Dictionary
2 ENTRIES FOUND:

focal plane

noun

Definition of FOCAL PLANE

:  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

First Known Use of FOCAL PLANE

1889

focal plane

noun    (Medical Dictionary)

Medical Definition of FOCAL PLANE

:  a plane that is perpendicular to the axis of a lens or mirror and passes through the focus

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