ong light, and still separate the disksa measurable distance. The diameter must be large enough toobtain several zones without crowding the holes in the screentoo close together. Such lens systems are photographic lenses,short-focus telescope objectives, etc. The method has been used on complete… … Fig. 10.—Method applied to complete telescope parallel, but some will intersect the axis at some point behind theexit pupil. If we take two shadowgraphs, one near the exitpupil and one some distance behind it, we can obtain the inter-sections of the rays with the axis. Let R^ and R2 (Fig. 10) be…
Lenses and optical systems
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