Using a laser light, glass block, and ruler, the physics of refraction of light was demonstrated. A normal beam incident upon a glass block at 90 deg. was shown to pass straight through the block. The block was outlined on a sheet of white paper and the normal ray drawn from air to block to air again. The laser was incident at an acute angle to the point of entry and the passage through the block outlined on the paper.The bending of the light was obvious as the laser beam entered the glass. The bending was defined as refraction and explained to occur due to the change in speed of the ray passing from air to glass. The direction of refraction was shown to be toward the normal previously drawn. The statement that light refracts toward the normal when passing from a medium of lesser density to a medium of greater density was written. The converse was shown when light travels from a higher density to a lower density. The refraction is away from the normal. One of the classwork problems from Wed. was corrected and shown geometrically how to solve it. The bending of light was reinforced by placing a pencil leaning up in a beaker of water, and noting the virtual bending of the pencil.