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2.To experimentally determine the Verdet constant of a glass tube, tube made of SF-57 glass,  which describes the strength of Faraday effect of within  the glass tube: $$\varphi_{B}=C_{v}BL$$  where $\varphi$ is the shift in polarization, B is the strength of applied magnetic field and L is the length of the glass tube. The magnetic field causes a change in polarization, and measuring the Verdet constant of the glass tells us how much change in polarization there was within the glass due to the magnetic field.