Influence of quantum correction on black hole shadows, photon rings, and lensing rings *

Abstract We calculate photon sphere and critical curve $b_c$?> for a quantum corrected Schwarzschild black hole, finding that they violate universal inequalities proved asymptotically flat holes satisfy the null energy condition in framework of Einstein gravity. This violation seems to be common phenomenon when considering modification Furthermore, we study shadows, lensing rings, rings hole. The leads larger bright ring observational appearance thin disk emission near hole compared with classical Our analysis may provide evidence effect general relativity.