Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 145
ting surfaces, a second spherical surface, with its vertex at S2 and its centre of curvature at M2, being the boundary between the medium of refractive index and the third medium of index The radius ?'2 of this second surface is S2M2 or P2M2, where P2 is the point where the ray meets it, and is… … or A2. Then, considering the relations between the angles and sides_^of the triangle P2M2L(^, we have sin (/)., = sin A. . . . • [71 ; or, calling the distance between the two vertices and by the symbol , «0 + r.y - d. mn<ly,= ^sinA, . . . [8]. ~ 2 Also, from the law of refraction, Ip+i • j [9]-…
Photographic optics
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