A-LevelPhysicsWaves9702/12 · May/June 2022 · Q261 Mark
Two polarising filters are placed next to each other so that their planes are parallel. The first polarising filter has its transmission axis at an angle of 50° to the vertical. The second polarising filter has its transmission axis at an angle of 20° to the vertical. The angle between the transmission axes of the two polarising filters is 30°. A beam of vertically polarised light of intensity 8.0 W m⁻² is incident normally on the first polarising filter. What is the intensity of the light that is transmitted from the second polarising filter?
Azero
B2.5 W m⁻²
C2.9 W m⁻²
D6.0 W m⁻²
✓ Correct answer
B: 2.5 W m⁻²
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