paraxial rays


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par·ax·i·al rays

in geometric optics, those rays focused at the principal point.
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The right diagram in Figure 14 is the distortion, in which the vertical axis signifies light waves at different heights whereas the horizontal axis means the differences (measured in percentages) between actual and paraxial rays focused on the image plane.
Optical Design with Narrow-Band Imaging for a Capsule Endoscope
plane consisting of systems of paraxial rays describing distribution of
On the descriptive geometric interpretation of Pauli Principle, elements of the Mendeleev table of chemical elements, and the Newtonian laminar current of a liquid

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