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 = 1.33, uniformly covers the top of a glass plate, n = 1.65. 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 both interfaces
at neither interface
air-film
omit
Question 2
What is the wavelength of red, 666-nm light as it travels through the film?
666 nm
886 nm
404 nm
501 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?
250 nm
125 nm
167 nm
333 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?
125 nm
167 nm
250 nm
333 nm
omit
Question 5
In general, when red light is removed from white light, the film would appear to be which color?
yellow
grey
cyan
magneta
omit
Question 6
What is the frequency of the red light as it travels through the film?
1.5 x 10
20
hz
4.5 x 10
14
hz
3.39 x 10
14
hz
5.99 x 10
-4
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?
1.49 x 10
-9
sec
1.75 x 10
-12
sec
9 x 10
-10
sec
1.35 x 10
-12
sec
1.91 x 10
-12
sec
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