Thin Film Interference Soap Bubbles
On this worksheet you will be investigating the basic properties of
thin film interference
A thin soap bubble, n = 1.35, is filled with air. Since the medium outside the bubble is also air, at which of the interfaces (air-soap and soap-air) would the light undergo a 180° phase change upon reflection?
at neither interface
at both interfaces
What is the wavelength of red, 772-nm light as it travels through the film?
At what minimum non-zero thickness of the film will the intensity of the red light reflected back into the air be a maximum?
At what minimum non-zero thickness of the film will the intensity of the same red light reflected back into the air be a minimum, or experience destructive interference?
In general, when red light is removed from white light, the soap bubble would appear to be which color?
What is the frequency of the red light as it travels through the soap film?
2.88 x 10
5.25 x 10
3.89 x 10
1.72 x 10
If the soap film were instead specified to be 592 nanometers thick, which wavelength in the visible spectrum would be canceled?
8.77 x 10
1.6 x 10
1.18 x 10
4 x 10
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Catharine H. Colwell
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