College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 75

Two rectangular optically flat plates ( n = 1.52) are in contact along one end and are separated along the other end by a 2.00-mmthick spacer (Fig. P24.24). The top plate is illuminated by monochromatic light of wavelength 546.1 nm. Calculate the number of dark parallel bands crossing the top plate (including the dark band at zero thickness along the edge of contact between the plates).