principal point


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prin·ci·pal point

one of two points on an optic axis so related that an object at one is exactly imaged at the other without magnification, minification, or inversion.

prin·ci·pal point

(prin'si-păl poynt)
One of two points on an optic axis so related that an object at one is exactly imaged at the other without magnification, minification, or inversion.

principal point

One of two points so situated that the optical axis is cut by the two principal planes.
See also: point
References in periodicals archive ?
For the second year in a row, the principal point of exit for pipeline exports to Mexico was Clint, Texas.
This is a concession to Israel's refusal even to discuss the status of occupied East Jerusalem, a principal point of conflict throughout the talks, though the U.
The partners responsible for these desks are the principal point of contact for clients.
A contemporary observer of the relevance of the FSA plans said, "From the viewpoint of urban communities, perhaps the principal point of interest in FSA achievements in this field is the satisfaction registered by the physicians directly concerned and by organized medicine in general.
The principal point of discussion was that W-3 was too permissive.
The focal length is the distance from the principal point of the lens to its focal point.
Though it wasn't intended to be, the OEO became the government's principal point of contact with the black ghettos and the black power movement.
Cette demande a ete le principal point inscrit a l'ordre du jour de la recente visite de la haute representante de l'UE pour les affaires etrangeres et la politique de securite, Federica Mogherini.
The findings were released today by Direct Relief in The State of the Safety Net 2014, an annual report that examines issues and trends within the extensive network of nonprofit, community-based health centers and clinics, which are the principal point of access to healthcare and the medical home for persons with low incomes, without health insurance, and among the country's most vulnerable.
Kamal Nath will be the principal point person for liaising between the party and the government, as well as the government and the UPA partners and the Oppn
Leur manque de taille etait l'un de leur principal point faible.