X1014307866-00184-43015</DOCNO> Ray Tracing and Problem-Solving Lesson 1: Refraction at a Boundary Boundary Behavior Refraction and Sight The Cause of Refraction Optical Density and Light Speed The Direction of Bending The Secret of the Archer Fish Lesson 2: The Mathematics of Refraction The Angle of Refraction Snell's Law Ray Tracing and Problem-Solving Determination of n Values Lesson 3: 