This paper deals with the properties of the images of truncated one-dimensional periodic bar targets formed by aberration-limited optical systems. Attention is directed to the problem of determining how many bars are required at a given spatial frequency in order to obtain an image which closely approximates that for an infinite-chain periodic bar target. Numerical calculations are carried out for the case of an aberration-limited, glancing-incidence x-ray telescope.
J. W. Foreman, Jr., G. H. Hunt, and E. K. Lawson, "Images of Truncated One-Dimensional Periodic Bar Targets in Aberration-Limited Optical Systems," Appl. Opt. 10, 105-108 (1971)