  We analyze the null geodesic equations in five dimensional spherically
symmetric spacetime with collapsing inhomogeneous dust cloud. By using a new
method, we prove the existence and non-existence of solutions to null geodesic
equation emanating from central singularity for smooth initial distribution of
dust. Moreover, we also show that the null geodesics can extend to null
infinity in a certain case, which imply the violation of cosmic censorship
conjecture.
