An electromagnetic wave in vacuum has the electric and magnetic field `vecE` and `vecB`, which are always perpendicular to each other. The direction of polarization is given by `vecX` and that of wave propagation by `vecK`. Then

Options

A. `vec(X) ||vec(B) and vec(k) ||vec (B) xx vec (E)`
B. `vec(X) ||vec(E) and vec(k) ||vec (E) xx vec (B)`
C. `vec(X) ||vec(B) and vec(k) ||vec (E) xx vec (B)`
D. `vec(X) ||vec(E) and vec(k) ||vec (B) xx vec (E)`

Answer

C

Explanation

In the polarisation of light, it is the electric field that gets polarised and the direction of polarisation is perpendicular to direction of oscillation
Direction of polarisation ` = vec (X) ` , it must be perpendicular to ` vec(E) ` and parallel to ` vec (B) `
`vec(X) || vec (B)` and direction of propagation ` vec (k) || vec (E) xx vec(B) `