1. From Bubbles to Holograms

2. Thin Film Interference (Iridescence)
Occurs when rays from top and bottom of film destructively interfere with one another.
Color is complement of color that is destroyed through interference
Color is determined by thickness of film
Examples: soap bubbles, gasoline on water, opal, CD, seashells and pearls
Check Question: What color corresponds to the thickest portion of a soap bubble? How about the thinnest?
Laser Disk of colors in soap bubble

3. Diffraction Grating Many slits instead of 2
Reinforce bright and dark fringes in monochromatic light
Produce spectra in white light
Smaller spacing of lines produces wider spacing of bright and dark fringes
Same equations as 2 slits; d=1/slit spacing

4. Laser Light Light from incandescent source Monochromatic Light
Coherent Light
Laser Light Properties
Stays in straight line and does not spread out
Follows conservation of energy
All energy in one place rather than spread out

5. Hologram
Third dimension is recorded in interference pattern which is reproduced by irregular diffraction grating.
Set-up for making hologram
Holographic properties
Cutting results in multiple holograms
Holographic magnification