Non-equatorial deflection of light due to Kerr–Newman black hole: a material medium approachSaswati Roy, Shubham Kala, Prasanjit Ghosh, Hemwati Nandan and Asoke K. SenEur. Phys. J. C, 85 8 (2025) 925DOI: https://doi.org/10.1140/epjc/s10052-025-14659-z