If I don't understand some parts of code in Wolfram demonstrations, where or who should I turn to. Is there any resources on the internet that I can use. The thing I want to do is a model of achromatic prism, and therefore I need to understand these two previously .

http://demonstrations.wolfram.com/DispersionOfLightThroughAPrism/

http://demonstrations.wolfram.com/LightRayInAPrism/

But I have difficulties in doing that. The problem is not the program language I think I get that in principal, its rather that I don't understand some parts specific to the problem. I was hoping if there are some references from the authors or their explanations of demonstrations that I could read. So could anyone point me to somewhere I could get help on this one or I'm on my own here?