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A sphere la to ba illuminated aa uniformly «a poeafble by N incident btaw, of light, each beam biing directed radially on the aphere and tha dlamster of cha croaa aectlon of the beta being equal to the diameter of cha aphere. Tha beams are assumed to be of the aaaa intensity. Two functions naaurlns the uniformity of the illumination *r« propoced: tjj t being the maximum of tha absolute valua of the lnteulcy on tha aphera.alnua the average lntanalty on tha aphcre; and tha function,