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This lecture delves into the wave equation for electromagnetic waves, transitioning from mechanical systems to electromagnetic waves. The instructor explains the derivation of the D'Alembert wave equation, the application to different mediums, and the correlation between the electric and magnetic fields. The lecture covers the prediction of electromagnetic waves by Maxwell, the transverse nature of these waves, and the importance of the E field vector in defining the wave's polarization. The instructor also discusses the concept of plane waves, the relationship between frequency, wavelength, and wave velocity, and the significance of polarization in electromagnetic waves. The lecture concludes with a comprehensive overview of the electromagnetic spectrum and the vast range of wavelengths it encompasses.