Refractive Reviews
5/5 rating based on 3 reviews. Read all reviews for Refractive for iPhone.
Refractive is free iOS app published by Xavier Daxhelet
Works Well
SpaceLana
This app includes a catalog of materials divided into gases, liquids, and solids. Clicking one gives you info about it and let's you select it for use as the incident or emergent material. Then go to the refraction tab to view a refraction simulation for the materials you've selected. You can change the frequency of light and the incident angle has a draggable handle so you can sweep through various positions and watch how the emergent angle varies in response.