principal distance
11principal — principal, ale 1. (prin si pal, pa l ) adj. 1° Qui est le plus considérable, en parlant de personnes. Les principaux magistrats. • Quand on bâtit une maison, quoique les maçons, les charpentiers, les plombiers, les menuisiers travaillent bien …
12Distance focale — « Focale » redirige ici. Pour les autres significations, voir Focale (homonymie). La distance focale d un système optique est la mesure de sa puissance de convergence (focus) ou divergence (diffusion) de la lumière. Un système avec une… …
13Principal component analysis — PCA of a multivariate Gaussian distribution centered at (1,3) with a standard deviation of 3 in roughly the (0.878, 0.478) direction and of 1 in the orthogonal direction. The vectors shown are the eigenvectors of the covariance matrix scaled by… …
14Principal axis theorem — In the mathematical fields of geometry and linear algebra, a principal axis is a certain line in a Euclidean space associated to an ellipsoid or hyperboloid, generalizing the major and minor axes of an ellipse. The principal axis theorem states… …
15Distance de visibilité — Pour les articles homonymes, voir Visibilité (homonymie). La distance de visibilité est la distance à laquelle les véhicules sur une route doivent maintenir avec un obstacle ou un changement de direction de la route afin de pouvoir réagir à temps …
16principal — adj Chief; leading; most important or considerable; primary; original. Highest in rank, authority, character, importance, or degree. As to principal challenge principal contract principal obligation principal office principal vein, see those… …
17principal points — /prɪnsəpəl ˈpɔɪnts/ (say prinsuhpuhl poynts) plural noun two points on the principal axis of a thick lens or lens system, such that if the object distance is measured from one and the image distance from the other, the equations relating object… …
18Principal quantum number — In atomic physics, the principal quantum number symbolized as n is the first of a set of quantum numbers (which includes: the principal quantum number, the azimuthal quantum number, the magnetic quantum number, and the spin quantum number) of an… …
19Principal focus — Focus Fo cus (f[=o] k[u^]s), n.; pl. E. {Focuses} (f[=o] k[u^]s*[e^]z), L. {Foci} (f[=o] s[imac]). [L. focus hearth, fireplace; perh. akin to E. bake. Cf. {Curfew}, {Fuel}, {Fusil} the firearm.] 1. (Opt.) A point in which the rays of light meet,… …
20Principal Triangulation of Great Britain — The Principal Triangulation of Britain was a triangulation project carried out between 1783 and about 1853 at the instigation of the Director of the Ordnance Survey General William Roy (1726 1790). In 1782, General Roy had commissioned the… …
