Читать книгу Optical Engineering Science - Stephen Rolt - Страница 21

This brief description has provided a complete definition of an ideal optical system. No matter how complex (or simple) the optical system, this analysis defines the complete end-to-end functionality of an ideal system. On this basis, an optical designer will specify the six cardinal points of a system to describe the ideal behaviour of a design. These six cardinal points are:

 First Focal Point

 Second Focal Point

 First Principal Point

 Second Principal Point

 First Nodal Point

 Second Nodal Point

The principal and nodal points are co-located if the two system focal lengths are identical.