IGNOU PHE 9 2026 - Obtain expressions for reflection and transmission amplitude coefficie

Question

Obtain expressions for reflection and transmission amplitude coefficients when electric vector associated with a plane monochromatic electromagnetic wave which is in the plane of incidence.

28 Jan 2026

Answer :

Word Count : 462

When a plane monochromatic electromagnetic wave is incident on the interface between two different media, part of the wave is reflected, and part is transmitted. If the electric vector of the wave lies in the plane of incidence (known as p-polarization or parallel polarization), the boundary conditions at the interface allow us to derive the reflection and transmission amplitude coefficients using Maxwell’s equations. Consider two media with refractive indices (n_1) and (n_2), and let the angle of incidence be (\theta_i), angle of reflection (\theta_r), and angle of transmission (refraction) (\theta_t). By Snell’s law, we have (n_1 \sin \theta_i = n_2 \sin \theta_t). The electric field vector

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