It is difficult to understand the question.
If we look at a galaxy a couple of million light years away, the light that hits the retina at the back of our eye would have left the galaxy 2,000,000 years ago. Therefore we see the galaxy as it was two million years ago.
Once the light has hit our...
No, you can't derive electricity and magnetism from Newton't equations. For example, there is no way the charge on an electron could be derived, nor could the fact that like charges repel and unlike charges attract, and nor could the fact that a varying magnetic field induces a current in a wire.