1. Light and Optics PHYS 1090 Unit 8

2. Speed of Light c = 2.9979  10 8 m/s (in vacuum)

3. Electromagnetic Wave Energy Non-classical result: E = hf E = energy f = frequency h = Planck constant = 6.621  10 -34 J s

4. Electromagnetic Spectrum

6. Emission Lines Hydrogen Helium Neon Sodium Source: J. Strasbourg,I. Kiel after J. Tabbot. Data from NIST.J. Strasbourg,I. Kiel NIST

7. Hydrogen Emission “Thousand Ruby Galaxy” M83 Source: European Southern Observatory

8. Spectrum of the Sun Source: McMath-Pierce Solar Observatories

9. Reflection and Transmission (and absorption)

10. How Human Color Vision Works Source: Griffith, Physics of Everyday Phenomena 424530 560

11. Primary Colors redgreenblue

14. Bird and Reptile Color Vision Source: Scientific American, July 2006

15. Different material (like glass) Incident medium (like air) Light Interacting with a Material INCIDENT RAY REFLECTED RAY TRANSMITTED RAY

16. Refraction refracted ray AIR GLASS Normal (air-glass) Incident ray Normal (glass-air) transmitted ray

17. Lens Properties A lens can either cause the rays to converge or diverge

18. Using Rays Ray tracing diagrams predict the location, orientation, and type of an image

19. Colors Split by Dispersion Source: Griffith, Physics of Everyday Phenomena, 4 ed.

20. Speed in Glass Depends on Index of refraction n = c/v c = vacuum speed v = speed in medium

21. Source: Griffith Prism Separates White Light

22. Primary Rainbow: 1 Reflection Source: Griffith, Physics of Everyday Phenomena 40° 42°

23. Secondary Rainbow: 2 Reflections Source: Griffith 54.5° 52°

24. Dispersion Creates Rainbows Source: Griffith

25. Diffraction and Interference Wave behavior You observed it with water waves It happens with light waves!

26. Temp Influences EM Radiation Higher T  greater power – P/A =  T 4 –  = 5.67  10 –8 J m –2 K –4 Higher T  higher peak frequency – max = b/T – b = 2.898  10 6 nm K Source: M. A. Seeds, Exploring the Universe