When the light photons bounce off a moving mirror, they react with its atoms to be reflected, consequently, the photons change their velocity vector after each impact depending on the velocity vector of the mirror and thus of the atom. The Michelson-Morley experiment was the event that changed the modern science about "the light" by leading to Lorentz and Einstein's theories about time. I made the formulas of the Michelson-Morley experiment by considering the effects of the reflection on the light and The rate (percentage) of fringe shift calculated by the formulas which I demonstrated is perfectly null. As a result not all physics must be wrong ,but only a principle that Einstein and Lorentz stated by fixing the light speed for all observers, which makes us study light in a very difficult way. The formulas demonstrated in this work allow us to study the light as a normal wave and to understand easily all the other light effects without being obliged to use any relativity of the time.