In the figure, a double-glazed window comprises two identical panes of glass (ng = 1.54) 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 n _a = 1.00)

40.00 Number mm 32.0 mm glass 25.6 mm air 32.0 mm glass