The effects that magnets have are on charged particles. It comes from the lorentz force equation
There will be a force F on a particle if it is charged (the q is the charge). The force will be from the electric field E and/or the cross product of the velocity of the charged particle with a magnetic field B. This is how the electron beam in a CRT is moved across the screen.
Since photons do not have charge they will not be affected directly by an electric or magnetic field. However, the magnetic field can cause changes in the medium (any medium, including vacuum) the photons are propagating through and therefore it is possible to affect the photons propagation with a magnet. For example, in some crystals and also in plasma the effective optical path length for left and right circular polarization is different depending on the presence and orientation of a magnetic field. This is known as Faraday rotation. There are many other things that happen in plasmas when magnetic fields are present that changes how light propagates, or if it even does propagate, sometimes it will be absorbed due to the presence of a particular magnetic field geometry.
I dont know of any specific examples of bending photons with a magnetic field but there might be some out there.
Who says magents can't bend a laser beam? All you have to do is polish the magnet and put it in the path of the beam. Yes, I know that isn't causing it to bend but it still causes the light to go off in another direction.
Magnets can not bend light as far as I know so I definitely agree with what has been said. Magnetic fields can have an effect on light though. I don't think anything happens within a vacuum, but in a lot of dielectrics, aka glass, plastic, etc, you can rotate the polarization of the light. This is not the magnetic field directly affecting the light, but rather changing the properties of the medium.
Gravity is another one of those weird deals that doesn't directly affect the light, but rather it distorts space-time. A lot of you have probably seen some of the visualization of this on tv or elsewhere, but if you haven't imagine a marble on a sheet of some sort. The marble will sink down and deform the sheet. If you were to roll another marble to the side of the first, its path would be bent toward the hole. The same thing basically happens to light.
photons are massless, dimensionless particles. They are basically made up. There is no way (at least not at this point and probably never) for us to visualize light itself so to speak. Light behaves both as a wave and a particle so someone decided to call the particles of light photons. Physicists tend to just make things up to describe what they see and sweep the problems with it under the rug. It gets a lot worse when you start including quantum and classical physics together.
i dont remember the name, but when i went to USA (Cleveland, OH) i was taken to the science museum, and there was this huge IDK-if-it-was-a-van-de-graff machine but when you touched it, static electricity made your hair spike like hell