After a brief theoretical introduction, the procedure for plotting the sections of an imaging cone from a point source, for one single zone of a lens in the presence of one or more aberrations is explained. The process is much simplified by a convenient graphical construction. A method is then described for projecting the sections due to coma and astigmatism on a screen so that they may be shown to a class. Photographs are included in the paper which show how remarkably the projected sections agree with the theoretically computed figures.
© 1933 Optical Society of America
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