Light deflection angle through velocity profile of galaxies in f(R) model Vipin Kumar Sharma, Bal Krishna Yadav and Murli Manohar Verma Eur. Phys. J. C, 81 2 (2021) 109 Published online: 02 February 2021 DOI: 10.1140/epjc/s10052-021-08908-0