As you may have learned when studying the properties of thermal energy, building contractors often install double-glazed windows to prevent thermal energy (\"heat\") from entering/exiting the building. Although effective as insulators, such windows present interesting optical effects. In the figure, a double-glazed window comprises two identical panes of glass (ng = 1.46) separated by an air gap. If the light encounters the glass at an angle of 40.00° with respect to the glass, find the shift in path ?x as the light enters the room. (Use na = 1.00)