Anatomical manipulation, or, The methods of pursuing practical investigations in comparative anatomy and physiology : also an introduction to the use of the microscope, etc., and appendix (1844)
Tulk, Alfred, d. 1891, Henfrey, Arthur, 1819-1859 · London : Van Voorst · leaf 110
OPTICAL PRINCIPLES. 91 be exactly the same as that of the first, the oppositedirection of their surfaces being counterbalanced by thedifferent conditions of the refraction. Hence the focusor point of convergence of the rays, in a double convexlens, will be just half the length of that of a… … of curvature (fig. 22,) while that of a plano-convex willbe its diameter (fig. 23). 150. Fig 22 also shows, that as a convex lens willbring parallel rays to a focus in the centre of the circle,it must cause rays diverging from that focus to take aparallel direction. Again, by the same law…
Anatomy, Comparative · Dissection · Microscopy
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