Re: re3: Do other fields also bend where materials of different densities meet?

Hi Roman,
light is an electromagnetic wave, that is it consists of both an electric and a magnetic field. They are perpendicular to each other and each of them is perpendicular to the direction of propagation. Maxwell's equations relate both fields. Only static magnetic and electric fields (independent of time) can be separated. But time dependent electric fields, such as electric waves, come together with time dependent magnetic fields and vice versa. The effect of a medium on the electric field is described by the electrical permittivity, on the magnetic field respectively by the magnetic susceptibility.

Gravity waves can also be bent. Gravitational fields are affected by energy or mass. So if you look at a distant galaxy and there is some enormous amount of mass in between you and the galaxy its light will be diffracted. Actually this has already been observed. Here are some useful links: NASA; Peter Newbury; wikipedia; windows to the universe.

I hope this helps
Michael