Erratum to: Optical properties of Kerr–Newman spacetime in the presence of plasmaGulmina Zaman Babar, Abdullah Zaman Babar and Farruh AtamurotovEur. Phys. J. C, 82 5 (2022) 403DOI: https://doi.org/10.1140/epjc/s10052-022-10326-9