Physics (AS & A Level) · May / June 2026 · Paper 11 · Question 23

A vertically polarised electromagnetic wave has an intensity of $3.2 \times 10^4\,\mathrm{W\,m^{-2}}$. The wave is incident on a polarising filter that has a transmission axis at an angle $\theta$ to the vertical. The transmitted wave has an intensity of $2.5 \times 10^4\,\mathrm{W\,m^{-2}}$. What is $\theta$?

1. A28°
2. B39°
3. C52°
4. D62°

As printed in the paper