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| Extension | Links |
|---|---|
| Extension A: How Do Waves Move? | |
| Extension C: Reflection of 2D Waves | |
| Extension D: Seismic Waves |
| Extensions | Links |
|---|---|
| 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] |
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