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Objective: Demonstrate the Faraday effect and determine the Verdet constant for flint glass

Optically isotropic, transparent, non-magnetic materials become optically active in a magnetic field. They rotate the plane of polarisation of linearly polarised light passing through them in the direction of the magnetic field because clockwise and anti-clockwise circularly polarised components of the light take differing amounts of time to pass through. This effect is known as the Faraday effect. In this ex-periment, the Faraday effect will be measured for flint glass. This particular type of glass exhibits a high degree of very uniform optical dispersion. The way that the frequency depends on the refractive index n is given to a good approximation by a Cauchy formula.