Vertically polarised light of intensity I_0 is incident normally on a polarising filter. The transmission axis of the filter is at an angle θ to the plane of polarisation of the light. The intensity of the light after passing through the filter is I_0 / 3. [Diagram shows vertically polarised light of intensity I_0 incident on a filter. The filter's transmission axis is at angle θ to the vertical plane of polarisation. Light after filter has intensity I_0/3.] What is θ?

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