PHYS 1750: SELECTED TOPICS in PHYSICS
LECTURE 39.
Interference
25.1. | Interference | ||
1. | Superposition revisited | ||
2. | Putting waves together | ||
25.2. | Diffraction | ||
25.3. | Young's Double Slit Experiment | ||
1. | The set-up | ||
2. | Path-length differences | ||
3. | The resulting "fringe" pattern | ||
4. | Mathematical relationships | ||
5. | Implications for light | ||
a. Light has wave properties | |||
b. Each "photon" goes through both slits | |||
25.4. | The Diffraction Grating | ||
1. | The set-up | ||
2. | Path-length differences | ||
3. | The resulting pattern | ||
4. | Wavelength dependence | ||
5. | Opal and feathers | ||
25.7. | Thin Films | ||
1. | Reflections and Phase Changes | ||
a. | "Hard" reflections: phase shift 180 deg | ||
b. | "Soft" reflections: no phase shift | ||
c. | Hard/Soft vs. index of refraction ratio | ||
2. | Soap bubbles | ||
3. | Oil on water | ||
4. | Glass coatings | ||
5. | Biological mirrors |