• Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads


Total Views
On Slideshare
From Embeds
Number of Embeds



Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

    No notes for slide


  • 1. Thin-Film Interference
    • Requires the thickness of a very thin surface to vary from the top to the bottom.
    • When the light reflects off the front surface is a multiple of ¼ of the wavelength of the light reflecting of the back surface, the waves interfere to reinforce a specific color.
    • The colors change as the thickness of the film changes, and the ¼  is met at different locations for different colors.
  • 2. Two-Slit Interference
    • When light passes through two parallel slits, the light is diffracted, and spreads out. The spreading light resulting from each slit overlaps. A pattern of alternating bright and dark bands forms on an observing screen, resulting from constructive and destructive interference of light waves from the two slits.
  • 3. Effects of Changing Wavelength and Source Distance
  • 4. Effect of Wavelength on Interference Effects
    • The nodal and anti-nodal lines spread farther apart as the wavelength gets larger
  • 5. Effect of Distance On Interference Effects
    • The nodal and anti-nodal lines spread farther apart as the sources come closer together.
  • 6. Two-Slit Interference Pattern
  • 7. Diffraction
    • The bending of light around an obstacle or through a small opening.
    • Because wavelengths of light are so small, you usually don’t see light diffraction. The interference patterns are very small.
    • Diffraction grating – a piece of glass or plastic with thousands of parallel slits placed very close together.
  • 8. Example of Diffraction