Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 82
A i ± Kd [i] The + sign must be taken where the new point is fartherfrom the centre than the point for which the curvature Ris specified ; the — sign when it is nearer the centre. Thisproposition is of use in dealing with thick lenses, and withthin lenses at a given distance apart. Refraction… … Fig. 39. source of waves incident on the surface, PM being a lineperpendicular to SS. The wave-fronts, at successive smallintervals of time, are represented by arcs of circles. At a 62 LIGHT LECT. I certain moment the wave, had it been going on in air,would have had for its surface the position SAS…
Light · X-rays
Internet Archive · UBC Library · Public Domain Mark 1.0. Free to use for anything.
