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Jan8-12, 11:18 AM
P: 374
The chief ray is that ray that passes through the aperture stop. In the object is an on-axis point source, its chief ray will go though the AS.
What if the object is a planar object, located where the on-axis point source is? Will the chief rays from the off-axis points making up the planar, extended object all pass through the center of the AS too?

Will these off-axis points see the same aperture as the aperture stop for the system?

If an object is 3-dimensional, can we still select one aperture in the optical system to be the AS? A 3D object is composed of point sources located on different planes....