Question

The intensity of polarized light after passing through a polarizer is given by?

Answer 1

The intensity of polarized light after passing through a polarizer is given by $I=$  $Iocos^2\alpha$

Malus's law says that when a perfect polarizer is placed in a polarized beam of light, the irradiance, I, of the light that passes through is given by

$I = Io cos^2 \alpha$

where Io is the initial intensity and

$\alpha$ = is the angle between the light's initial polarization direction and the axis of the polarizer.

A beam of unpolarized light can be thought of as containing a uniform mixture of linear polarizations at all possible angles. Since the average value of $cos^2\alpha$  is 1/2, the transmission coefficient becomes

I/I0 =1/2.

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