Ghosh, RajesRajesGhoshSarkar, SudiptaSudiptaSarkar2025-08-222025-08-222021-07-012331-8422http://arxiv.org/abs/2107.07370https://d8.irins.org/handle/IITG2025/18398We present a novel theorem regarding light rings in a stationary spacetime with an ergoregion. We prove that any stationary, axisymmetric, and asymptotically flat spacetime in 1 + 3 dimensions with an ergoregion must have at least one light ring outside the ergoregion. A possible extension of the proof for asymptotically de-Sitter and anti-de-Sitter spherically symmetric black holes is also discussed.en-USe-Printe-Print123456789/615