Posted 25 March 2013 - 01:07 PM
I think it would be awfully close, but not exactly. YOu would have to factor in the refractive index of the glass, also. THe light is travelling at an angle through the glass, that angle is set by the refractive index. The difference in the length of the travel is not the difference in the thickness of the glass, but the the difference in the hypoteneuse of a right triangle formed by the thickness of the glass as the altitude of the triangle, and the difference in exit points of the ray which form the base of the right triangle. Change the thickness of the glass, and you lengthen the hypoteneuse even more.
Note......this is just me thinking, not me knowing.