Question

A linearly polarized electromagnetic wave given as E = E_oî cos (kz – ωt) is incident normally on a perfectly reflecting infinite wall at z = a. Assuming that the material of the wall is optically inactive, the reflected wave will be given as ______.

विकल्प

• E_r = `- E_ohati cos (kz - ωt)`

• E_r = `E_ohati cos (kz + ωt)`

• E_r = `- E_ohati cos (kz + ωt)`

• E_r = `E_ohati cos (kz - ωt)`

Answer 1

A linearly polarized electromagnetic wave given as E = `E_ohati cos (kz - ωt)` is incident normally on a perfectly reflecting infinite wall at z = a. Assuming that the material of the wall is optically inactive, the reflected wave will be given as `underline(E_r = E_ohati cos (kz + ωt))`.

Explanation:

When a wave is reflected from a denser medium or perfectly reflecting wall made with optically inactive material, then the type of wave doesn’t change but only its phase changes by 180° or π radian.