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The surface density $\Sigma$-map and the convergence $\kappa$-map of BulletCluster 1E0657-558 show that the center of baryonic matters separates from thecenter of gravitational force, and the distribution of gravitational force donot possess spherical symmetry. This hints that a modified gravity withdifference to Newtonian inverse-square law at large scale, and less symmetry isworth investigating. In this paper, we study the dynamics in Randers-Finslerspacetime. The Newtonian limit and gravitational deflection of light in aRindler-type potential is focused in particular. It is shown that theconvergence in Finsler spacetime could account for the observations of BulletCluster.

Gravitational deflection of light in Rindler-type potential as a possible resolution to the observations of Bullet Cluster 1E0657-558