Thin Film Interference Glass Coating
On this worksheet you will be investigating the basic properties of
thin film interference
A thin film, n = 1.4, uniformly covers the top of a glass plate, n = 1.63. If the medium above the film is air, at which of the interfaces (air-film and film-glass) does the light undergo a 180° phase change upon reflection?
at neither interface
at both interfaces
What is the wavelength of red, 633-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 film would appear to be which color?
What is the frequency of the red light as it travels through the film?
3.39 x 10
1.36 x 10
4.74 x 10
6.64 x 10
If the glass plate is 28 centimeters thick, how many seconds would be required for the transmitted beam to travel through the glass?
1.47 x 10
1.75 x 10
1.99 x 10
9.33 x 10
1.52 x 10
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Catharine H. Colwell
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