Page:Harold Dennis Taylor - A System of Applied Optics.djvu/10

FORMULA		PAGE
IXc.	Back Focal Length of a Thick Lens or Pair of Elements, equivalent to Formula Va	26
X.	Equivalent Focal Length of a Thick Lens or Pair of Elements, equivalent to VI. and VII.	27
XIa.	Three Separated Thin Lenses or Elements. Position of First Principal Point	33
XIb.	Three Separated Thin Lenses. Position of Second Principal Point	34
XII.	Three Separated Thin Lenses. Equivalent Focal Length	34
XIII.	Four Separated Thin Lenses or Elements. Equivalent Focal Length	34
XIVa.	Four Separated Thin Lenses or Elements. Position of First Principal Point	35
XIVb.	Four Separated Thin Lenses or Elements. Position of Second Principal Point	35
XV.	Five Separated Thin Lenses. Equivalent Focal Length	36
XVa.	Five Separated Thin Lenses. Position of First Principal Point	36
XVb.	Five Separated Thin Lenses. Position of Second Principal Point	37
XVI.	Six Separated Thin Lenses or Elements. Equivalent Focal Length	37
XVIa.	Six Separated Thin Lenses or Elements. Position of First Principal Point	37
XVIb.	Six Separated Thin Lenses or Elements. Position of Second Principal Point	37
XVII.	Eight Separated Thin Lenses or Elements. Equivalent Focal Length	38
XVIIa.	Eight Separated Thin Lenses or Elements. Position of First Principal Point	38
XVIIb.	Eight Separated Thin Lenses or Elements. Position of Second Principal Point	38
SECTION IV Spherical Aberration. Complete Formulæ of the Second and of the Third Orders of Approximation
XVIII. (R.)	Direct Refraction at Single Surface Spherical Aberration	55
XVIII. (L.)	Linear Value of above Aberration	55
XIX. (R.)	Spherical Aberration of a Thin Lens or Element	56
XIX. (L.)	Linear Value of above Aberration	57
XX. (R.)	Refraction at a Single Surface Aberration to the Third Approximation	63
XXI. (R.)	Thin Lens or Element. Spherical Aberration of the Second and of the Third Orders of Approximation	64
XXII. (R.)		65