Please help me understand something. I've read that the actual center of curvature for a mirror is the average of the distances from your eye to the mirror and the light source to the mirror. Theoretically, if you place your eye at the same distance they are the same. The question is, how do you ensure that your eye is placed consistently in the same position for each reading? It seems that since you are taking very precise measurements, a small movement of your head could result in a huge error. Am I missing something? Thanks in advance and clear skies.
Bill
Bill