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|Extension A: How Do Waves Move?|
|Extension B: An Analogy for Refraction [Wave Refraction]|
|Extension C: Reflection of 2D Waves|
|Extension D: Seismic Waves|
|Extension A: Drawing Light Ray Diagrams for Pinholes and Shadows|
|Extension B: Further Investigations of Mirror Reflections and Images [More on Mirror Reflections and Images]|