Intrinsic polarization of RS Oph after the 2021 outburst. The degree of polarization is presented in blue. Strong depolarization effects are well visible in the first week after the start of the 2021 outburst (left column). The normalized intensity is presented in red. The orange line represents the power law fit of the degree of polarization data. The index of the power law increases in the first week after the start of the 2021 outburst (left column). Subsequently, from day 300 to day 352, the power law index decreases (right column).