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  1. // Persistence of Vision Raytracer 2.0
  2. //
  3. // This file defines a few Index of Refractions for various materials
  4. // for sodium light.  Source: College Physics by Arthur L. Kimball, PhD.
  5. // 4th Edition (1923)(!)
  6. // ---------------------------
  7. #declare Flint_Glass_Ior = 1.71
  8. #declare Crown_Glass_Ior = 1.51
  9. #declare Diamond_Ior = 2.47
  10. #declare Water_Ior = 1.33
  11. #declare Air_Ior = 1.000292
  12.