Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 545
determinmg the focus of a concave lens isgiven in article 560. 555. Optical centre, secondary axis.—In every lens there is a pointcalled the optical centre, which is situate on the axis, and which has theproperty that any luminous ray passing through it experiences no angulardeviation ; that is,… … two surfaces of a double convex lens. Since the two plane elements of thelens A and A are parallel, as being perpendicular to two parallel right lines,it will be granted that the refracted ray AA is propagated in a mediumwith parallel faces. Hence a ray KA, which reaches A at such an…
Physics
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