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 542
gations, meet. Double convex lenses have both realand virtual foci, like con-cave mirrors. Real /od.—We shallfirst consider the casem which the luminousrays which fall on thelens are parallel to itsl)rincipal axis, as shownin fig 501. In this case,any incident ray, LI5, inapproaching the normal ot… … Fig. 5
Physics
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