The figure shows a wave transmitted from air through a thin oil film on water. The film has a thickness t =/2, where is the wavelength of the light while in the oil.
a. Referring to the indices of refraction shown on the figure indicate at each boundary with a Y (yes) or N (no) whether the reflected wave undergoes a phase change at the boundary.
b. Draw in the reflected wave from the first boundary (air/oil) and the reflected wave from the second boundary (oil/water). Extend both reflected waves back to the left edge of the figure. Hint: If there's no phase change, the reflected wave retraces the incoming wave. With a phase change, the reflected wave is "upside-down" relative to the incoming wave.
