1. HW #2, Due Sep. 7
Chapter 2
P7, P12, P16, PH1, PH2

2. Reading Assignment: All Chapter 2
This Lecture:
Chapter 2
Geometric Optics
Reading Assignment: All Chapter 2
By the way, what is refractive index?!!

3. Geometrical Optics (Chapter 2)
When objects are much larger than the wavelength
Light Rays (Ray Optics)

4. Shadows *Shadow-point source *Shadow: Extended Source
*Shadow: Extended Source

5. Solar Eclipse: Aug
Earth
Moon
SUN

7. The Lunar Eclipse

8. Pinhole Camera *Pinhole Camera

10. Depth of Image and more
2 pinholes

11. The effect of pinhole size

12. Diffraction

13. Reflection *Oscillating Charge Field

14. Law of Reflection
Normal

16. Mirrors Why metals reflect light? Why do they appear certain color?
Why can we listen to radio stations far away?
Silvered and half-silvered mirrors
First-surface and second-surface mirrors
*Oscillating Charge Field

17. Reflectivity (how much is reflected?)
Grazing Incidence Reflection (glass windows, water surfaces, waxed floors, etc.)

18. Who sees me in the mirror?!
(field of view)

19. Sun Pillars and Sub Suns

20. Ice Crystals

21. Sub Sun
A bright subsun looking downwards from 11,000m over Italy, late afternoon 18th July The halo was intermittently visible over the southern and central parts of the country covered by a thin cirrus sheet. The halo elongated and contracted as the tilts of the plate crystal mirrors changed. Reflections from lakes and rivers shine through the cloud. Video by Les Cowley.

22. Sub Sun

24. Sun Pillar

25. Multiple Reflections Example: Second Surface Mirrors

26. Corner Reflectors