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 = 1.32, uniformly covers the top of a glass plate, n = 1.62. 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?
air-film
at neither interface
film-glass
at both interfaces
omit
Question 2
What is the wavelength of green, 539-nm light as it travels through the film?
408 nm
711 nm
539 nm
333 nm
omit
Question 3
At what minimum non-zero thickness of the film will the intensity of the green light reflected back into the air be a maximum?
270 nm
204 nm
135 nm
102 nm
omit
Question 4
At what minimum non-zero thickness of the film will the intensity of the same green light reflected back into the air be a minimum, or experience destructive interference?
135 nm
102 nm
270 nm
204 nm
omit
Question 5
In general, when green light is removed from white light, the film would appear to be which color?
grey
magenta
yellow
cyan
omit
Question 6
What is the frequency of the green light as it travels through the film?
4.22 x 10
14
hz
1.23 x 10
20
hz
5.57 x 10
14
hz
7.35 x 10
-4
hz
omit
Question 7
If the glass plate is 26 centimeters thick, how many seconds would be required for the transmitted beam to travel through the glass?
1.2 x 10
-12
sec
1.4 x 10
-9
sec
1.8 x 10
-12
sec
1.61 x 10
-12
sec
8.67 x 10
-10
sec
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