1. Define refraction of a wave.    2. Draw and label a diagram to show the path of light from air to glass to air.    3. Complete the following sentences:        a. When light enters glass from air, it bends               the normal.             This is because light                             in glass as it is                          than air.                    b. When light enters air from glass, it bends                           the normal.             This is because light                           in air as it is                             than glass.        c.  Water waves travel                in deep water but                 in shallow water.