principal axis

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principal axis

n
1. (General Physics) the line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror
2. (General Physics) any of three mutually perpendicular axes about which the moment of inertia of a body is maximum
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Noun1.principal axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"
axis - a straight line through a body or figure that satisfies certain conditions
References in periodicals archive ?
Throughout the different places and periods under review, Lekon addresses himself to four principal axes, helpfully characterised in the opening chapter.
enhancement service road sweeping mechanic serving with the exclusion of the principal axes envisaged in the Action Plan approved by DDG 87/2015.
He showed that it is possible to separate the influence from material anisotropy from the effect of applied stresses only when one of the principal axes, due to the texture, coincides with the direction of applied stresses.
The orthotropic closures are based on the assumption that the principal axes of the approximated fourth order tensors are in alignment with the principal axes of the second order tensor [14].
Finally, we compute the principal axes of the human's body and locate the human's head and feet positions at those phases.
A positive addition comes in the form of numerous booths highlighting literature for children, one of the principal axes of this year's fair.
Correspondence analysis determines the principal axes of inertia and for each axis the corresponding eigenvalue, which is the same as the inertia of the cloud in the direction of the axis.
We consider the principal axes of the outer clad to coincide with the optical axis along the z-direction, and the extraordinary principal axis attains a radial orientation.
The principal axes are eigenvectors of the inertia tensor matrix of cluster markers.
Three principal axes (a, b, c represent the longest, medium and shortest axis, respectively, as shown in Fig.
For example, when the orthotropic material moves from principal axes 1 and 2 to turned axes 1' and 2' at the angle [phi] = [45.