Science Fact of the Day September 12, 2009
Posted by spatialrift47 in SFoTD.add a comment
If a light ray at the transition between two substances strikes at a large enough angle, and if the second substance has a lower index of refraction than the first, all the light will be reflected at the boundary, and none will enter the second substance. This is called total internal reflection, and it really helps the light come to terms with who it is inside.
