Rancang Bangun Modul Eksperimen Pengaruh Besar Medan Magnet pada Media Zat Magneto-Optik terhadap Perputaran Bidang Getar Cahaya Terpolarisasi Linier = Design and Development of An Experiment Module To Study The Effect of Magnetic Field Strength On the Rotation of The Polarization Plane of Linearly Polarized Light In Magneto-Optic Media