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By using an electronic computer, rays were traced through six optical systems used in infrared spectrometers to determine what broadening of the image takes place as a result of geometrical-optical aberrations. The data obtained indicate that Littrow instruments, using either a prism or a grating, form sharp images in a plane behind that of the entrance slit. Czerny-Turner optical arrangements form images in front of the entrance slit plane which are not so sharp as those formed by the Littrow instrument. Comparison of broadening due to geometrical-optical aberrations with that due to diffraction shows that in most cases the former is considerably less. The data presented show graphically the curvature of the image formed.
Yoshinaga et al. (Sun,) studied this question.