Why does light bend when its speed is slowed?

that`s not really refraction, refraction is more akin to re-direction, rather than slowing

Yeah, and light does indeed go slower, it's because the medium is different.

Like when light goes from a less dense material (medium1) to a more dense material (medium2) it bends toward the normal. why does it bend?

light (photons) is a cross between a wave and a particle. In a vacume it`s speed is a constant. in a medium it is then subject to gravitational forces that will slow it a tiny bit.

it doesn`t travel in a straight line exactly either, it`s a bit like a wave form going up and down, but the overall waveform does travel in a straight line (if unhindered).

a bit like crinckle cut potato chips when you thow one.

gravity effects light because of it`s Particle nature, but this particle can only exist if it`s as a waveform also. you`de never find a stationary photon.

This reminds me why I'm not into physics. It can be explained by the Huygen's principle, that every point on a wave front propagates a spherical wavelet, and the effect of changing speeds as light changes medium on the way these wavelets propagate. That's about as good as I can do. This site probably has the best picture to explain it:

 

http://www.sciencefx.com/huygens.htm