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 96
.74 And it m = - , r — r =5, A = co , v = .0006, 2 A' = 15, A" = r = 5, f 3 5* 100 x 2 lx) A = ) - . — . - + 100 ( - - - ) \ t 2 1 5' 15 \3 .15 5/ j 10 340) = -{ iv 9* + 9$ 350 9 = - .023 In this case also the aberration diminishes the focal length. 3. For the double-convex lens r is negative. … Here the focal distance is negative, and the aberration positive, so that they are still contrary. Observe that the aberration is more than twice as great in the concave lens than in the convex with equal radii.
Geometrical optics
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