Menu  Dispersion attributes

Dispersion section of the ifmDielectric material
Turns dispersion on and off. When selected, this feature simulates the dispersion of color which, for example, creates the rainbow effect when light travels through a glass prism.
Abbe Number
The Abbe Number is a measurement of how dispersive a material is. For example, optical glass (Glass BK7) has a Abbe Number of 64. You can find various reference lists on the Internet.