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the pupil at y_p= 0. The principal ray is both sagittal and meridional. All other sagittal rays are skew rays.
*A paraxial ray is a ray that makes a small angle to the optical axis of the system and lies close to the axis throughout the system. Such rays can be modeled reasonably well by using the paraxial approximation. When discussing ray tracing this definition is often reversed: a "paraxial ray" is then a ray that is modeled using the paraxial approximation, not necessarily

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