- Sections
- A. General Materials & Mathematics
- B. Statics
- C. Kinematics & Dynamics
- D. Rotational Mechanics
- E. Gravitation & Astronomy
- F. Fluid Mechanics
- G. Vibrations & Mechanical Waves
- H. Sound
- I. Thermodynamics
- J. Electrostatics & Magnetostatics
- K. Electromagnetic Principles
- L. Geometrical Optics
- M. Wave Optics
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- P. Modern Physics
M4-21. Soap Film Interference - Simple Large Version
Purpose
Very simple and clear demonstration of soap film interference.
Equipment
Bright point source, wire loop with soap solution.
Setup Time
5 minutes.
Images
Description
A Bright point source of light at the right illuminates a soap film in the wire ring. The transmitted light is seen at the left and the reflected light at the rear between the transmitted light and the wire ring. Note that the ref lected and transmitted colors are complements. After a while the top section of the film becomes less than one-quarter wavelength thick, so the waves reflected from the front and rear surfaces of the film are out of phase, resulting in no reflected light .
References
David Lovett, Demonstrating Science with Soap Films, 204 pp., Institute of Physics Publishing, Philadelphia, 1994. ◙Goran Ramme, Colors on Soap Films - An Interference Phenomenon, TPT 28, 479-480 (1990).
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See pagesm2. diffraction circular
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See pagesm3. interferometers
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See pagesm4. thin film interference
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See pagesm6. holograms
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See pagesm7. polarization & scattering
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See pagesm8. optical activity & birefringence
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See pagesm9. elliptical polarization
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See pagesm2. diffraction circular
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See pagesm3. interferometers
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See pagesm4. thin film interference
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See pagesm6. holograms
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See pagesm7. polarization & scattering
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See pagesm8. optical activity & birefringence
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See pagesm9. elliptical polarization