11ac1064_ions___Astronomy___Black_Holes__Question
[Date Answered] May 11, 2010 [Questioner (age, location)] Dorna (Scotland) [Answer] According to Einstein's General Relativity Theory, light is also affected by gravity. Black holes are very massive objects with extremely intense gravitational field. There is something call "event horizon" around black holes. It is the point where the gravitational attraction becomes so strong that the velocity at which an object would have to move to escape the gravitational field equals the speed of light. Since the speed of light is, according to the relativity theory, the maximum possible speed, nothing, not even light, could escape the black hole once it is inside the event horizon. [Question] 
how does blackhole act with the light?
Quickie Questions - Astronomy - Black Holes