As you know, the refractive index of a specific material is a function of wavelength. This phenomenon is called dispersion. The Sellmeier equation is an empirical formula for calculating the wavelength-dependent refractive index of a particular transparent medium. For common optical material, the refractive index is computed with 6 sellmeier coefficients (B1,2,3 and C1,2,3). Unfortunately I couldn’t find these coefficients for CR-39, or allyl diglycol carbonate (ADC), in databases that are available in literature (even in Schott Glass and Ohara catalogues).
The relation of dispersion of such polymer is often difficult to find....
The best way to get it is to measure it yourself (e.g., by spectroscopic ellipsometry).
As a good approximation you could use Conrady's equation of dispersion:
n(lambda)=n0+A/lambda+B/((lambda)^3.5)
in which lambda is in microns, and n0=1.485, A=0.009 and B=0.00055.
Hope this helps you.
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