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 ?
When the velocity is measured in the principle axis of material, we are able to compute the residual stresses presented in the material.
Principle axis factoring with oblique rotation was used to uncover the underlying structure of the SISQ.
s], with the easy direction parallel to a principle axis of the cube.