Laurence, Lionel · London, School of Optics · leaf 264
e powers ofany pair of Mers. at right angles to each other=T> + D. Rotation of the axis ofone or both cyls. merely locates the refraction in varying quantities asregards each of any pair of opposite meridans, and does not alter the totalpower. 252 GENEEAL AND PRACTICAL OPTICS Let b (Fig. 274) be… … Fig. 274. with that of D, and let d be the angle it makes with that of D. Then angle&=c + d. Now J)1 corresponds with the axis of D2, and D2 with the axis of DL.From the foregoing we have D + D=D1 + D2 and D sin2 c + D sin2 d=Dv also D cos2 c + D cos2 d^D1 Multiplying these together we get…
Optics
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