1. Q3. Use your answer from Q2 to find the angle of refraction when the angle of incident is; a) 30 o b) 80 o c) 0 o Q4. What happens to the period of the wave when it gets refracted? Q1. Define the term ‘refractive index’ Q2. α = 45 o, β = 32 o Calculate the refractive index

2. Medium Absolute Refractive Index Air1.00 Water (liquid)1.33 Water (ice)1.31 Vegetable Oil1.46 Silica (quartz)1.46 Human Cornea1.38 Flint Glass1.65 Diamond2.42 Glycerol1.47

3. n 1, n 2, n 3, … = absolute refractive index 1 n 2 = relative refractive index where: Example: If light travels from water to diamond, what would be the relative refractive index?

4. Try this! Refractive index of water = 1.33 Refractive index of air = 1.00 Light travels from water into air Angle of incidence = 75 o Angle of refraction = ???

5. Critical Angle The angle of incidence where light entering an optically less dense medium refracts at right angles Total Internal Reflection Where light is totally reflected instead of being refracted. Occurs when the angle of incidence is greater than the critical angle.