Coddington, Henry, -1845 author · Cambridge : Printed by J. Smith, printer ot the University, for J. Deighton & Sons, and G.B. Whittaker, Ave Maria Lane · leaf 94
_ • ’ 12 … This is positive, if A be less than (m + 1) r, and negative when A is above that value ; when A =(m + 1) r, there is no aber¬ ration. See p. 54. Note. When r is negative, or the surface convex, the aberration is always positive. 99- We now Pass 0)1 to the aberration in a lens, (Fig. 96-) We may…
Geometrical optics
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