1. Reflection and Refraction
Overview of Waves, Part 2
Reflection and Refraction

2. Wave Theory of Christian Huygens (1629-1695):
Each point on a wavefront acts like a source of point waves… The constructive and destructive interference of these waves continually recreates the wavefront as it moves at the wave speed
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3. Angle of incidence = Angle of reflection
Law of Reflection
Angle of incidence = Angle of reflection

5. Snell’s Law of Refractionq2 q1

7. Critical Angle
When light passes from a material with a higher n into a material with a lower n, it refracts away from the normal line
At a critical angle (based on the two materials), the refracted light will be bent right along the surface

8. Effects of Refraction

9. Total Internal Reflection
If light traveling from a higher n material toward a lower n material strikes the surface at an angle greater than the critical angle, total internal reflection results

10. Examples of Total Internal Reflection