CONTENTS
xi
| FORMULA | PAGE | |
| XXIIIa. | Expression for Angular Value of the Coma in the Primary Plane, produced by Oblique Refraction through a Parallel Plane Plate | 237 |
| XXIIIb. | The above when an Element occurs at the Second Surface | 237 |
| XXIV. | Angular Value of the Coma in Primary Plane produced by Eccentric Oblique Reflection from a Spherical Mirror | 243 |
| SECTION IX
Distortion and the Rectilinearity of Images—Von Seidel's Fifth Condition | ||
| I. | The Expression for the Tangent Ratio apart from Spherical Aberration | 250 |
| II. | Coddington's Formula expressing Ratio between the Tangents of Emerging and Entering Principal Rays, inclusive of the Spherical Aberration | 251 |
| IIa. | Coddington's Formula for above in case of Two Lenses in Succession | 254 |
| III. | New Universal Formula for Distortion of Image | 262 |
| IV. | Same, applied to a Series of n Lenses or Elements | 264 |
| (23). | The Linear Distortion produced by a Parallel Plane Plate | 267 |
| V. | Formula for the Fractional Distortion produced by a Parallel Plane Plate | 268 |
| Formula for the Magnification produced by a Telescope | 278 | |
| VI. | Formula for the Magnification produced by a Simple Microscope or Lens | 279 |
| VII. | Formula for the Magnification produced by a Compound Microscope | 280 |
| SECTION X
Achromatism | ||
| I. | Variation of the Power of a Lens due to Changes in Refractive Index consequent upon Colour | 281 |
| Ia. | Diameter of Least Circle of Chromatic Confusion | 282 |
| Ib. | Angular Value of above, subtended at Lens Centre | 282 |
| II. | Condition of Axial Achromatism for Two Lenses in Contact | 283 |
| III. | Condition of Axial Achromatism for Two Separated Lenses | 284 |
| IV. | Condition of Axial Achromatism for a Series of Separated Lenses | 285 |
| V. | The Chromatic Variation of after Direct Refraction through a Parallel Plane Plate | 286 |
