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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 $0.1$  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 found are $21\pm 5 \frac{radians}{T \cdot m}$, $21.095\pm0.003 \frac{radians}{T \cdot m}$ and $20.43\pm0.06 \frac{radians}{T \cdot m}$ respectively, and those values are consistent with each other within uncertainty.