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 = 1.36, uniformly covers the top of a glass plate, n = 1.56. 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?
film-glass
at neither interface
at both interfaces
air-film
omit
Question 2
What is the wavelength of red, 638-nm light as it travels through the film?
638 nm
868 nm
409 nm
469 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?
117 nm
319 nm
235 nm
160 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?
117 nm
160 nm
235 nm
319 nm
omit
Question 5
In general, when red light is removed from white light, the film would appear to be which color?
magneta
cyan
yellow
grey
omit
Question 6
What is the frequency of the red light as it travels through the film?
6.39 x 10
-4
hz
3.46 x 10
14
hz
1.41 x 10
20
hz
4.7 x 10
14
hz
omit
Question 7
If the glass plate is 27 centimeters thick, how many seconds would be required for the transmitted beam to travel through the glass?
1.88 x 10
-12
sec
1.4 x 10
-9
sec
1.41 x 10
-12
sec
1.66 x 10
-12
sec
9 x 10
-10
sec
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