  We present a detailed study of gravitational lensing around a rotating BTZ
black hole in (2+1) dimensional gravity. The study of orbits for massless test
particle around this BH spacetime is performed to describe the nature of
cosmological constant in lower dimensions. We study the effect of cosmological
constant on the photon orbit in view of other critical parameters. The bending
angle of light is studied in view of different values of cosmological constant
for direct and retrograde motion of test particles. It is being observed that
the bending angle slightly decreases as the value of cosmological constant
increases in the negative region.
