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Fig. 10


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Geometrical construction relating group birefringence Bg to phase birefringence B(λ) (solid line curve); the tangent T0(λ) to the curve B(λ) at λ0, crosses the ordinate axis corresponding to λ = 0, at the value Bg(λ0) of the group birefringence for λ0. This figure is obviously derived from Figure 4.

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