A plane polarised wave has amplitude A. The wave is incident normally on a polarising filter. The transmission axis of the filter is at angle $\theta $ to the plane of polarisation of the incident wave. What is the amplitude of the wave that emerges from the filter?
$Acos\theta $
2 )
$Aco{s^2}\theta $
3 )
${A^2}cos\theta $
4 )
${A^2}co{s^2}\theta $
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