____________[br]Reflection and Refraction[br]1. Reflect a ray: [url]http://www.geogebratube.org/material/show/id/111895[/url][br]2. One side is reflective: [url]http://www.geogebratube.org/material/show/id/112443[/url][br][b]→3. Lamp[/b][br]4. Refract a ray: [url]http://www.geogebratube.org/material/show/id/112931[/url]