C

where x is the height of the ray at the lens.

If B = 0, the lens is equiconvex; if B = —1, the lens is plano-convex and, if B = 1, the lens is convexo-plane (Fig. 9.1). Similarly, if C = 0, the conjugates are in symmetry with the lens, i.e.z' = —z; if C = —1, the object is at infinity; if C = 1, the object is at the first focal plane. With Coddington's variables, the surface curvatures of the lens and the convergence angles are expressed by ci = 2tKd(B + 1), ui = f (C + 1), = f (C — 1),

hence the curvature ratio c\/c2 and the transverse magnification M are

0 0

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