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The phrase "focal plane" is correct and usable in written English.
It is typically used in contexts related to photography, optics, and imaging, referring to the specific plane where light rays converge to form a clear image.
Example: "To achieve the best focus in your photographs, ensure that your subject is positioned at the focal plane of the camera."
Alternatives: "focus plane" or "image plane".
Dictionary
focal plane
noun
Any plane perpendicular to the axis of a lens or mirror
Exact(60)
Focal plane array.
One focal plane was analyzed.
This enables multi-band focal plane arrays to be realized.
The focal plane operating temperature will be 43 K (nominally).
The inset shows the intensity pattern in the focal plane.
The number of visible landmarks on the focal plane.
After the focal plane, the inverse effect occurs.
The infrared seeker is an indium antimonide focal plane array.
Cells in the uppermost focal plane were not counted.
The focal plane was kept constant during an experiment.
One focal plane images are shown unless otherwise specified.
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