This pair of Polaroid Filters is mounted inside a rotating scale which can be supported on an optical bench. A pointer indicates around a circular scale and points to 'zero' where the filters are aligned so that transmission of light is at a maximum. The rotation in degrees on either side of zero is easily measured as the filters reduce the transmitted light to zero at 90 degrees. The diameter of the filter at the centre is 50mm.
NSW Physics Syllabus Reference
Module 7: The Nature of Light
Light Wave Model
- Conduct investigations quantitatively using the relationship of Malus’ Law 𝐼 = 𝐼max𝑐𝑜𝑠^2𝜃 for plane polarisation of light, to evaluate the significance of polarisation in developing a model for light