Principal-axis
noun
1.
Optics. a line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror.
2.
Physics. one of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum.
principal axis
noun
1.
the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror
2.
any of three mutually perpendicular axes about which the moment of inertia of a body is maximum
Read Also:
- Principal boy
noun 1. the leading male role in a pantomime, played by a woman
- Principal-clause
noun 1. the main clause.
- Principal-diagonal
noun 1. Mathematics. See under diagonal (def 9). adjective 1. Mathematics. connecting two nonadjacent angles or vertices of a polygon or polyhedron, as a straight line. extending from one edge of a solid figure to an opposite edge, as a plane. 2. having an oblique direction. 3. having oblique lines, ridges, markings, etc. noun 4. […]
- Principal-focus
noun, Optics. 1. focal point (def 1). principal focus noun 1. another name for focal point
- Principal-ideal
noun, Mathematics. 1. the smallest ideal containing a given element in a ring; an ideal in a ring with a multiplicative identity, obtained by multiplying each element of the ring by one specified element.