Refractive Index of NPB


For a typical sample of NPB the refractive index and extinction coefficient at 632.8 nm are 1.785 and 0.000. Below are files of complete refractive index and extinction coefficients. If the file is not available for download, you can request our proprietary file by clicking "Request".

  • Proprietary encrypted file for use with Filmetrics systems
Wavelength (nm)

Refractive Index Reference - Filmetrics Composite

No guarantee of accuracy - use at your own risk.