Mr. Hamann's Ray Diagram Practice Problem #4 (concave lens) Mr. Hamann's Ray Diagram Practice Problem #3 (convex lens) Converging Lenses - Designmate. How It's Made: Optical Lenses. Drawing Lens Ray Diagrams - King David High School. How Do Lenses Work - Explainer TV. Ray Tracing (Converging Lens) Ray Tracing (Converging Lens 2) Ray Tracing (Diverging Lens)