Along with your analysis, calculations, and final answers, explicitly indicate the physics principles, definitions or concepts used, the general equations in symbolic form, and a sketch or diagram if applicable or helpful. Be certain to include units to answers when appropriate. Also include any comments you would like to share with Bill about the problem set. Here are two old GRE exam questions. As usual, just include the appropriate choices as the solution to this problem.
Unpolarized light is incident on two ideal polarizers in series.
The polarizers are oriented so that no light emerges through the second polarizer. A third polarizer is now inserted between the first two and its orientation direction is continuously rotated through 180 degrees. Way back at the beginning of the term, we found a technique for determining the steady state solution for the damped, driven oscillator when the driving term was harmonic. Use your assumption and the equation in part a to derive the dispersion relation given in Eq. You don't need to know anything about the boundary condition.