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\section{Abstract}  We performed an experiment to measure the Faraday rotation of polarized light passing through a magnetic field, as well as measuring the Verdet constant of an SF57 glass tube with a length of 0.1 m. Our results are consistent with the general idea of Faraday rotation, which suggests that linearly polarized light experiences rotation when applying a magnetic field. We used three different methods to find Verdet constants, which are Direct Fit, Slope Fit and Lock-in Method.  The values we foundfor the Verdet constant  are $20.96\pm 5.24 \frac{radians}{T \cdot m}$, $21.0950\pm0.0025 \frac{radians}{T \cdot m}$ and $20.430\pm0.058 \frac{radians}{T \cdot m}$, m}$ respectively,  and those values are consistent with each other within uncertainty.