Journal of the Society of Motion Picture Engineers (1930-1949)

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660 ELLSWORTH D. COOK Therefore, for the two extreme indices of refraction, Yl = r |_ 2U(H\ 1) r Ur [j. s. M. p. E. (17) and, Hence, and ,,-2)-.£| ..(18) fni + n2 2\ _1 Lv r ; PJ •(19) + DU(ni -n,)l T^F P7(m n2)H »i + n, -2) -rj ^ t/ + • ^~ ..(20) In the last form, Wm is expressed as the sum of two terms, the first is that considered in the usual magnification formula while the second .03 SO ^^. FIG. 8. Experimental results for auxiliary increase in effective aperture width due to chromatic and spherical aberration in a lens chosen to exaggerate effects. term is the minimum increase in effective aperture possible with chromatic aberration under the above assumptions. It is interesting to note that the increment of aperture due to chromatic aberration