No, it is not true that light can travel back in time. According to our current understanding of physics, the travel of light is always forward in time.
The concept of light traveling back in time is often associated with the idea of time travel and the theory of relativity. However, it is important to clarify the distinction between the travel of light and the possibility of time travel.
In special relativity, which was developed by Albert Einstein, the speed of light in a vacuum is considered to be the maximum speed at which information or any physical object can travel. According to this theory, as an object with mass approaches the speed of light, its mass increases and the required energy to accelerate it further becomes infinitely large. This phenomenon is known as time dilation, where time appears to slow down for the moving object relative to a stationary observer.
While time dilation has been experimentally confirmed, it does not mean that light can travel backward in time. Light always travels at the speed of light in a vacuum, and from the perspective of a photon, time does not elapse at all. Therefore, light does not experience time travel or move backward in time.
It's worth noting that the topic of time travel is still a subject of active scientific research, and theories and ideas continue to evolve. However, there is no evidence or theoretical basis to support the notion that light can travel backward in time.