Retardancemeaning

In a single medium, the phase advancement given in terms of the distance traveled and the phase shift , so     (1) where k is the wavenumber and is the wavelength> In a medium with N layers,         (2) In terms of the optical path length , (3) © 1996-2007 Eric W. Weisstein

In a medium with N layers,         (2) In terms of the optical path length , (3) © 1996-2007 Eric W. Weisstein