1. 31 outline particles, waves, and light
propagation and scattering of light
reflection and refraction
dispersion
polarization

2. Light
can behave as wave or particle

3. Interference
interference is
evidence of the
wave nature of light

4. Photoelectric Effect
Light stimulates emission of electrons from metal.
 Kmax independent of light intensity
 explained by ‘photon’ concept of light.

5. Light Photon Smallest ‘bundle’ of electromagnetic field
Carries energy and momentum

6. continuous
hydrogen
helium
barium
mercury

7. Electron energy transitions
leading to Line Spectra
Example:

8. elastic scattering
spontaneous emission
Photoelectric effect
Stokes Raman scattering
Anti-Stokes Raman scattering
stimulated emission
Compton scattering
Resonance absorption

12. Huygen’s Principle
each part of a wave at some instant is a ‘source’ point of waves
the wave at a later instant is the tangential envelope of the point-sources

13. Fermat’s Principle
Light speed in materials is v = c/n. In glass v is about c/1.5 A B

14. Actual light path from A to B is the path which takes the least time.

15. Law of Reflection

16. Snell’s Law

17. Use Snell’s Law to find the angle of refraction.

18. Light reflects and refracts at material boundaries.

19. Total Internal Reflection

20. Calculate critical angle if index of water is 1.33.

21. Mirages
index of refraction of air depends on density of air

22. Light Dispersion
Color separation in material with wavelength dependent index of refraction

23. Polarization of light by reflection

24. End