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 | ||