Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 48
her removed the point of divergence,the more nearly will the rays approach the parallel direction: until,at length, when the object is very distant, its rays in effect becomeparallel, and are brought together in the principal focus (Fig. 3).If, on the other hand, the point of divergence be withm… … Eays already converging, brought together by a double-convex lens at a point nearer than its principal focus; andrays diverging from a point within its principal focus, stilldiverging, though in a diminished degree. convex lens, they will be brought together at a point nearer to it thanits centre…
Microscopy · Biology
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