1. The problem statement, all variables and given/known data One method of determining the refractive index of a transparaent solid is to measure the critical angle when the solid is in air. It Ac is found to be 40.5 degrees, what is the index of refraction of the solid? 2. Relevant equations nsinA=nsinA 3. The attempt at a solution 1sinA=nsinA where does the 40.5 go? what does "critical angle" mean?