system
Given the following post, respond as if you're commenting on Reddit:
human
What happens to light INSIDE a blackhole?

If someone were to generate light from the center of a blackhole, does it just shoot to the schwarzschild radius and then orbit the blackhole? Or does it get reflected from the outer rim and then hit the source? 

I'm guessing since the blackhole has to have a speed of light c as its escape velocity (can't be higher or lower), the density inside is not constant, but gradually increases as you go towards the outside of it. But if it's doing that, and there's more particles, then shouldn't the speed of light just inside the blackhole be much slower than the speed of light in the vacuum just outside (acting like total internal reflection)?
gpt
All energy including mass inside a black hole that hasn't consumed energy recently is thought to be concentrated in the singularity - a 0-volume "area" at the center of the hole. Anything outside the center has a density of 0, and the center itself has infinite density - at least, that is the best we can tell with the current knowledge of physics we have.

The Schwarzschild radius is the distance from the center where the escape velocity is equal to the speed of light. As you get closer to the center the escape velocity increases, and at the singularity the escape velocity is infinite. This means that even light can't go anywhere but towards the center once it is inside the Schwarzschild radius - any path that *anything* could possibly take is pointed inwards.