Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 65
e rays toassume a parallel direction, which are diverging from thatcentre before they impinge upon it (Tig. 2); so that, if aluminous body be placed in the principal focus of a double-convex lens, its divergent rays, falling on one surface of thelens as a cone, will pass-forth from its other side… … Eays already convcrtrinu-, brousrht-together at a point nearer thanthe principal focus ; and rays diverginijc from a point within the prin-cipal focus, still diverging, though in a diminished degree. rays be diverging from a distant point, their focus will be moredistant from the lens than its…
Microscopy
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