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 ?
Designers now look closely at the projectiles they plan to use, along with twist rate, propellant, case geometry, how the cartridge headspaces, and throat and chamber design to minimize projectile Principle Axis Tilt (PAT).
The principle axis of the reference wave forms a certain specified angle with that of the object wave which is normal to the CCD plane so that this system belongs to the image-plane off-axis holography.
When the velocity is measured in the principle axis of material, we are able to compute the residual stresses presented in the material.