A-LevelPhysicsWaves9702/12 · Oct/Nov 2013 · Q301 Mark
When plane-polarised light of amplitude A is passed through a polarising filter as shown, the amplitude of the light emerging is A cos θ. [Figure 30.1] The intensity of the initial beam is I. What is the intensity of the emerging light when θ is 60.0°?
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A0.250 I
B0.500 I
C0.750 I
D0.866 I
✓ Correct answer
A: 0.250 I
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