A sheet of plastic (index of refraction = 1.5), 1.6 cm thick is used in bank teller's window. A ray of light strikes the sheet at an angle of 68 degrees. The ray leaves the sheet @ 268 degrees but at a different location. Calculate the distance between the ray that leaves and the one that would have left if the plastic were not there.THE ANS IS 1.0 cm but I have no clue how to get it. Q___Q
Sounds like a plane-parallel plate of plastic as shown in section 2.3 here:
