Definitions for focal plane
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Random House Webster's College Dictionary
fo′cal plane`(n.)
a plane through a focal point and perpendicular to the axis of a lens, mirror, or other optical system.
Category: Optics
Origin of focal plane:
1890–95
Citation
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"focal plane." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/focal plane>.