A vertically polarised electromagnetic wave of intensity $I_0$ is incident normally on a polarising filter. The transmission axis of the filter is at an angle of $30^\circ$ to the vertical.
The transmitted wave from the first filter is then incident normally on a second polarising filter. The transmission axis of this filter is at an angle of $90^\circ$ to the vertical.
What is the intensity of the wave after passing through the second filter?
1 )
$0$
2 )
$0.063 I_0$
$0.19 I_0$
4 )
$0.56 I_0$
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