In desperation, Leo found a PDF online: Iskander Solutions Manual.
"Solve the first half of the problem on your own," Dr. Nia said. "Derive the wave equation from Maxwell’s curl equations. Then, open the manual. Did you get the same intermediate expression? If yes, great. If not, compare your logic, not your final numbers. Did you forget that the permittivity changes in the dielectric? The manual shows you where you missed a step, not just what the step is." Electromagnetic Fields And Waves Iskander Solutions Manual
At that moment, Professor Dr. Nia walked into the study lounge. Seeing Leo’s distress, she sat down. In desperation, Leo found a PDF online: Iskander
Leo confessed about finding the solutions manual. "Derive the wave equation from Maxwell’s curl equations
"But," she continued, "the solutions manual is not the lighthouse. It is the beam of light from the lighthouse. It doesn't move your ship for you. It simply shows you where the rocks are."
"Stuck on the waveguide problem?" she asked.
"Once you understand the given solution," she smiled, "change the problem. The manual says the wave is polarized parallel to the plane of incidence. What if it's perpendicular? The manual's answer becomes your starting point for a new adventure."