Reflection & Refraction of Light Reflection: specular (mirror) vs diffuse angle of incidence = angle of reflection Refraction: Snell’s Law n 1 sin 1 = n 2 sin 2
Total Internal Reflection Snell’s Law from glass to air: n 1 sin 1 = n 2 sin 2 n g sin critical = n air sin n air
Group Problem If a beam of light takes nanoseconds to travel the distance L = 2.22 cm as shown below, what is the angle of incidence that the beam makes with the surface?2 cmL=2.22 cmθin2=1.5n1=1.0