1. The problem statement, all variables and given/known data Consider a solid glass rod of length 75cm and diameter 1.5cm with n=1.46. Light enters the center of the end of the rod from the air. What is the maximum angle of incidence for which the light is totally reflected inside the rod? 2. Relevant equations n1 sin (A1) = n2 sin (A2) 3. The attempt at a solution I don't know where to start because I don't know what is meant by "totally reflected inside the rod". Any help would be greatly appreciated!