principal axis


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Related to principal axis: centre of curvature

principal axis

In optics, a line that passes through the optical center or nodal point of a lens perpendicular to the surface of the lens.
See also: axis
References in periodicals archive ?
In the horizontal scans, the principal axis of orientation changes continuously and follows contours that connect locations with an identical degree of whitening.
The first 530m of the Avenue leading out of Stonehenge is straight and follows the line of the principal axis north-eastwards, but in Stonehenge Bottom it curves eastwards and then southwards to join the Avon where, by this time, the earthworks around Bluestonehenge would have provided a riverside focus.
First, the ten measures of spirituality were subjected to a principal axis factor analysis.
The principal Axis I diagnosis for this group included Conduct Disorder (6), Oppositional Defiant Disorder (2), Post Traumatic Stress Disorder (6), and Major Depressive Disorder, primary or secondary (1).
Lines were drawn from the peripheral retinal cells in front of the tapetum to the rear nodal point and the angle these lines made with the principal axis was measured.
Up to 540 degrees rotation of the arm's principal axis has a unique "ball-track" soft-stop design that prevents arm damage common with conventional hard stops.
It was found that for all three water molecules the principal axis of the largest principal value is perpendicular to the plane of the water molecule, and the axis of the most negative principal value is parallel to the proton- proton direction.
In an attempt to design a questionnaire that could assess the multidimensional nature of paranormal beliefs, Tobacyk and Milford (1983) began with a principal axis factor analysis of 61 items believed to sample broadly paranormal beliefs.

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