1. The problem statement, all variables and given/known data A cubic container contains air, water, glycerin, amd diamond. There are no spaces between, and all boundaries are parallel. For light to travel through all of the substances, what is the maximum angle of incidence of the light ray in the diamond? 2. Relevant equations (n)(sin(critical angle))=(n)(sin(90º) n= index of refraction 3. The attempt at a solution Basically, I drew it out, found all the critical angles, got confused, then came here.