Trying to relate Equation 4.6, 4.7, 4.8 from here: http://physics.nmt.edu/~raymond/classes/ph13xbook/node35.html Basically trying to relate the deviation angle, incident angle, refractive index and apex angle. 2. The equations are in the link. 3. My attempts are less than fit to be posted, no clue where to begin. I've tried putting in trig identities, and it just not pretty. If you guys can help in someway greatly appreciate it.Thnx.