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focal plane

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focal plane

–noun Optics.
1. a plane through a focal point and normal to the axis of a lens, mirror, or other optical system. Compare principal plane.
2. the transverse plane in a telescope where the real image of a distant view is in focus.

Origin:
1890–95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: focal plane
Function: noun
: a plane that is perpendicular to the axis of a lens or mirror and passes through the focus
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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