Question

A beam of polarized light, has it's electric field at 30 degrees from the x-axis. This beam enters a set of two polarizers.  The first polarizer has it's polarization axis aligned with the x-axis and the second has it's polarization axis aligned with the y-axis.    The ratio of the intensity of the beam that emerges after passing through both polarizers to the intensity of the original beam is :

Answer 1

Let intensity of original beam =

Intensity after passing first polariser =   =

(Since angle between plane of polarisation of incident beam and polarisation axis of first polariser is 30°)

Intensity after passing second polariser(final intensity),

  

(Since angle made by second polariser with first polariser is 90°)

Therefore,

And

------(Answer )