There really is no good way to tell if there were imaginary flashes. Once you get down to really dim (i.e. low photon count) flashes, you're in the realm of Po

There really is no good way to tell if there were imaginary flashes. Once you get down to really dim (i.e. low photon count) flashes, you're in the realm of Poisson statistics. So, on average, a flash of light might have 4 photons in it, but it could easily have 1 or 7. Or 0! http://en.wikipedia.org/wiki/Poisson_distribution http://en.wikipedia.org/wiki/Poisson_distribution