Practice Problems
Thin Film Interference Glass Coating
Directions:
On this worksheet you will be investigating the basic properties of
thin film interference
.
omit
Question 1
A thin film, n = 1.39, uniformly covers the top of a glass plate, n = 1.6. 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
air-film
film-glass
omit
Question 2
What is the wavelength of red, 699-nm light as it travels through the film?
699 nm
437 nm
503 nm
972 nm
omit
Question 3
At what minimum non-zero thickness of the film will the intensity of the red light reflected back into the air be a maximum?
251 nm
350 nm
126 nm
175 nm
omit
Question 4
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?
126 nm
175 nm
350 nm
251 nm
omit
Question 5
In general, when red light is removed from white light, the film would appear to be which color?
grey
cyan
yellow
magneta
omit
Question 6
What is the frequency of the red light as it travels through the film?
5.97 x 10
-4
hz
4.29 x 10
14
hz
1.51 x 10
20
hz
3.09 x 10
14
hz
omit
Question 7
If the glass plate is 28 centimeters thick, how many seconds would be required for the transmitted beam to travel through the glass?
1.99 x 10
-12
sec
1.76 x 10
-12
sec
1.49 x 10
-9
sec
9.33 x 10
-10
sec
1.34 x 10
-12
sec
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