Theoretical Question about Black Holes

Alright, a black hole exists in a complete and perfect void... no light, matter... nothing. If one were to shine a light on the black hole, would it increase in size at all? I know photons don't have mass, but I was wondering if it would affect size at all?

>>6
How much volume does the singularity of a black hole have?  I always thought of them as a point with no volume.  Also, why is it that we can detect black holes based on the effect their gravity has on nearby light, I thought photons were massless & gravity was a property affecting mass?  (These are serious questions, I'm not as smart/educated as most of you)