File:Spidergraph Dispersion.GIF

Summary
Influences of selected glass component additions on the mean dispersion of a specific base glass (nF valid for λ = 486 nm (blue), nC valid for λ = 656 nm (red)). Please note, that the displayed diagram (also called spider-graph) is only valid for the specific base composition shown, otherwise it changes non-linearly. Reference: http://glassproperties.com/dispersion/