1. The King David High School Science Department Reflection and Refraction By Mr Jones

2. Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Normal Reflected Ray Incident Ray The normal is a line drawn at right angles (perpendicular) to the surface. i r Mirror = Angle of reflection (r) Angle of incidence (i)

3. Reflection For light reflecting off a plane mirror (flat, smooth, shiny): Mirror = Angle of reflection (r) Angle of incidence (i)

4. Refraction Incident Ray Normal Air Perspex Refracted Ray Normal Emergent Ray

7. As light passes from a more optically dense material into a less optically dense material it moves away from the normal. Normal Incident Ray Less optically dense More optically dense More optically dense Less optically dense Emergent Ray Normal

14. A tiny amount of light is reflected at the interface. Incident Ray Reflected Ray i<42° Refracted Ray

16. Some light is reflected at the interface.

17. 42° is described as the critical angle.Incident Ray 42° 90°

19. All of the light is reflected.

20. This is known as total internal reflection.Incident Ray Reflected Ray i>42°

21. Total Internal Reflection