Refractive index of solder mask

[raebrm]

Hello,

Does anyone know what's the typical refractive index of a green solder solder mask material?

Guess that this is not a typical question but we need the value for some optical system design. Cant seem to get the value from web.

Thnx!

 

[PCBWING]

You're right, this is a difficult question to answer. Is there any way you measure it?

 

[raebrm]

unfortunately i have no simple ways of measuring it. was hoping that there is a datasheet somewhere that gives the refractive index of solder mask.