1. 26.4. Polarization and the Reflection and Refraction of Light
Electromagnetic Wave

2. Polarized and Unpolarized Light

3. 26.4. Polarization and the Reflection and Refraction of Light

4. Dispersion

5. 26.5 The Dispersion of Light: Prisms and Rainbows

6. Indices of Refraction n of Crown Glass at Various Wavelengths
 Approximate Color 
 Wavelength in Vacuum (nm) 
 Index of Refraction, n 
 Red 
 660 
 1.520 
 Orange 
 610 
 1.522 
 Yellow 
 580 
 1.523 
 Green 
 550 
 1.526 
 Blue 
 470 
 1.531 
 Violet 
 410 
 1.538 

7. Simulation

8. The Physics of Rainbows
When sunlight emerges from a water droplet, the light is dispersed into its constituent colors, of which only two are shown.

9. Rainbow

10. Primary & Secondary Rainbow

11. Primary Rainbow
Water droplet disperses the light into colors.

12. Secondary Rainbow
Colors are reversed and less intense.