Physics (AS & A Level) · May / June 2024 · Paper 11 · Question 24

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 θ to the plane of polarisation of the incident wave. What is the amplitude of the wave that emerges from the filter?

1. AA\cos\theta
2. BA\cos^2\theta
3. CA^2\cos\theta
4. DA^2\cos^2\theta

As printed in the paper