Elements of natural philosophy (Volume 2-3) (1850)
Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 227
g surface, each zone will have its particular point ofconcentration or of diffusion, according as the foci arereal or virtual. Moreover, longitudinal aberration di-minishes the focal distance, that is, in general, // is lessthan f\ and the deviated rays which are in the samef^0,! , J ^ longitudinal… … Explanation ofthe figure; Caustic curve; Caustic surface; Section of thedeviated waveby a planethrough the axisof the surface; When the causticwill be real. be the exterior, and FDr its consecutive incident ray,D Fz and D F\ the corresponding deviated rays, theselatter will intersect each other at…
Mechanics · Acoustics · Optics
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