9. More about the normal. If we look at the triangular prism, on the other hand, it is tempting to say that the light is bent down, then down some more (or up, then up some more, etc. depending on your point of view). At first glance, this certainly appears to be the opposite behavior of what we saw with respect to the rectangular prism in #8. This would seem to require separate rules, 1 for what happens to light if the prism is rectangular, another if it is triangular (and probably still others for other shapes). Science prefers a few really powerful rules instead of lots of lots of different rules for different situations. Now go back and look at the bending on your triangular prism with respect to the normal: a.Going into the prism b.Coming out of the prism