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 ?
Le principal point a l'ordre du jour a porte sur l'examen des statuts et du budget des Femmes parlementaires du Commonwealth nouvellement constituees.
While the government did not have an institutionalized working group to address trafficking, relevant agencies and NGOs continued to meet on an ad-hoc basis, and a Ministry of Justice official continued to serve as principal point of contact on trafficking cases.
Whatever benefits owners, hirers, and slaves enjoyed within the many ways in which these hiring transactions were made, these were undermined or complicated by the second principal point that Martin makes regarding these practices.
The principal point of contact for administration of the PBL Awards program is Mr.
As the principal point of contact for drug testing programs in high school, college, and professional sports, certified athletic trainers often see the first signs of chemical use among athletes.
Once this becomes the principal point for fighting piracy, the French assert it follows that other efforts to preserve cultural diversity must be a good thing, too--including state subsidies for local artists.
As a principal point of contact with the DOE's Rebuild America Program on behalf of the sponsoring organizations, PTI will lend the technical experience of its staff and that of the PTI Urban Consortium Energy Task Force to DOE by offering assistance to increasing program efficiencies, furthering program development and coordinating information sharing.
Sexuality, too, forms a principal point of critical investigation:
The principal point of exit was Detroit, Michigan, accounting for 65 percent of the exports to Canada.
3) Make Pool Meadow the principal point for getting on and getting off buses.
Dickson is director of the Richmond, VA-based Virginia Department of Business Assistance, the principal point of communication between state government and basic employees in the Commonwealth, addressing issues of significance to business.