A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 374
cal distance for converging rays found ? In what position, with respect to the principal focus, will the conjugatefocus of diverging rays be situated ? What effect will the indefinite distance of the point of divergence pro-duce on the position of their focus ? With what point will it then coincide… … the rays will become parallel after refraction. And when F is be-tween O and C, as at H, the refracted rays will become diver-gent, as A L, B K, as if they had proceeded from a focus I, be-yond O and in front of the lens. The points E and G are termedthe conjugate foci, as before; and the conjugate…
Physics
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