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CAIE A-Level Physics AS 7.5.2 Maluss Law I I0 Cos2 to Calculate the Intensity of a Plane Polarised Questions

Use Malus’ law and polarisation concepts to analyse intensity through polarisers.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Use Malus’ law and polarisation concepts to analyse intensity through polarisers.

CAIE A-Level Physics AS 7.5.2 Maluss Law I I0 Cos2 to Calculate the Intensity of a Plane Polarised Questions question 1

[Maximum number: 1]

A student investigates the polarisation of microwaves. The microwaves from the transmitter are vertically polarised. A metal grille acts as a polarising filter when placed between the microwave transmitter and the receiver. The reading on the voltmeter is proportional to the intensity of microwaves transmitted through the grille.

When the transmission axis of the grille is vertical, the voltmeter reads 3.50 V .

Figure for Question CAIE A-Level Physics AS 7.5.2 Maluss Law I I0 Cos2 to Calculate the Intensity of a Plane Polarised Questions question 1 — CAIE A-Level Physics AS

The grille is then rotated through an angle θ\theta. The voltmeter now reads 2.20 V .
What is θ\theta ?

A

37.5∘37.5^{\circ}

B

39.0∘39.0^{\circ}

C

51.0∘51.0^{\circ}

D

52.5∘52.5^{\circ}

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