Shouldn't there be halo of EM waves around all the blackholes? When a star falls into a blackhole, there has to be some radiation perpendicular to the blackhole, which is at some point at the right distance to form a halo. Is the amount of bending of light due to gravity same for all EM waves, regardless of frequency? If not, there should be multiple halo for each of the EM waves. I understand we wouldn't be able to observe a perfect halo either.