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Figures (2)

Fig. 1
Fig. 1

Wavefronts of a pencil afflicted with spherical aberration. The section of beam before entering the refracting surface is circular and concentric with the optical axis. The insert gives a geometrical picture of the conditions.

Fig. 2
Fig. 2

Wavefronts of a pencil afflicted with spherical aberration. The section of beam before entering the refracting surface is circular and eccentric with respect to the optical axis, so that the axis of the beam strikes the refracting surface midway between center and margin of the beam as illustrated in Fig. 1. The insert shows the conditions geometrically.