IGNOU PHE 9 2026 - Obtain an expression for elliptically polarised light result

Question

Obtain an expression for elliptically polarised light resulting due to superposition of two orthogonal linearly polarised light waves. Show that plane polarised light and circularly polarised light are special cases of elliptically polarised light.

28 Jan 2026

Answer :

Word Count : 436

Elliptically polarised light arises when two linearly polarised light waves of the same frequency but differing amplitudes and a phase difference are superimposed along mutually perpendicular directions. Let us consider two orthogonal linearly polarised waves propagating along the z-axis. The electric field components of the waves along the x-axis and y-axis can be written as: ( E_x = E_{0x} \cos(\omega t) ) ( E_y = E_{0y} \cos(\omega t + \delta) ) Here, (E_{0x}) and (E_{0y}) are the amplitudes of the x and y components, (\omega) is the angular frequency, and (\delta) is the phase difference between

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