LAUSR

We investigate gravitational lensing by a primary photon sphere which is formed by unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a black-bounce spacetime which is suggested in [F. S. N. Lobo, M. E. Rodrigues, M. V. d. S. Silva, A. Simpson, and M. Visser, Phys. Rev. D 103, 084052 (2021)] in strong deflection limits. There is an antiphoton sphere between the primary photon sphere and the secondary photon sphere. If a light source and an observer are at the same side of the wormhole throat, not only infinite numbers of images slightly outside of the both primary and secondary photon spheres but also infinite numbers of images, which are formed by light rays reflected by the potential barrier near the antiphoton sphere, slightly inside of the primary photon sphere might be observed.