Physics (AS & A Level) · Feb / March 2023 · Paper 12 · Question 24

A beam of vertically polarised light is incident normally on a polarising filter. The filter can be rotated so that it is always in a plane perpendicular to the beam. The transmission axis of the filter is initially vertical. The filter is first rotated clockwise by an angle of 30° so that the transmitted light waves have intensity I30. The filter is then rotated clockwise by a further angle of 30°. What is the new intensity of the transmitted light waves?

1. A0.25 I30
2. B0.33 I30
3. C0.75 I30
4. D0.87 I30

As printed in the paper