If dark matter possess gravitational properties and does not interact with light, then why does light follow gravitational fields in space?
While dark matter does not interact with light, it still has mass and therefore exerts a gravitational force. The gravitational force of dark matter, like that of any other massive object, causes the curvature of spacetime. This curvature is what causes light to follow a curved path in the presence of a gravitational field.
In fact, the gravitational force of dark matter is thought to be a major contributor to the large-scale structure of the universe. Its gravitational pull on visible matter, such as galaxies, causes them to cluster together and form large-scale structures like galaxy clusters and superclusters.
So while dark matter itself does not emit, absorb or reflect light, its gravitational effects can be observed through its influence on the motion and distribution of visible matter, including the path of light.