![]() ![]() Light as an electromagnetic wave has oscillating electric and magnetic fields. This can be better understood using the Picket Fence analogy. The intensity of light that is allowed to pass through the filter depends on the angle between the filter and wave’s polarisation axis. The chemical composition of polaroid filters produces a specific transmission axis for light waves. The structure of the filter is arranged in a way such that only light with a particular polarisation axis can pass through. A polaroid filter is able to polarise light because of its chemical composition. ![]() Unpolarised light can be transformed into polarised light When a light wave possesses only one polarisation axis, it is polarised.When a light wave possesses many different polarisation axes, it is unpolarised.The axis along which the electric field oscillates is referred to as the polarisation axis. However, these fields can be orientated in infinitely many axes – as long as the two fields remain perpendicular. Electromagnetic waves possess electric and magnetic fields which oscillate perpendicular to each other.Polarisation of Light & Malus' Law What is polarisation? HSC Physics SyllabusĬonduct investigations quantitatively using the relationship of Malus’ Law `I=I_(max) cos^2 θ` for plane polarisation of light, to evaluate the significance of polarisation in developing a model for light (ACSPH050, ACSPH076, ACSPH120) This is part of the HSC Physics course under the topic Wave Model of Light. ![]()
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