Practice Problems
Thin Film Interference Glass Coating
Directions:
On this worksheet you will be investigating the basic properties of
thin film interference
revealed in different thicknesses film on glass.
omit
Question 1
A thin film, n = 1.28, uniformly covers the top of a glass plate, n = 1.55. 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
air-film
at neither interface
omit
Question 2
What is the wavelength of blue, 468-nm light as it travels through the film?
302 nm
366 nm
599 nm
468 nm
omit
Question 3
At what minimum non-zero thickness of the film will the intensity of the blue light reflected back into the air be a maximum?
91 nm
183 nm
117 nm
234 nm
omit
Question 4
At what minimum non-zero thickness of the film will the intensity of the same blue light reflected back into the air be a minimum, or experience destructive interference?
183 nm
117 nm
234 nm
91 nm
omit
Question 5
In general, when blue light is removed from white light, the film would appear to be which color?
cyan
yellow
grey
magneta
omit
Question 6
What is the frequency of the blue light as it travels through the film?
8.21 x 10
-4
hz
6.41 x 10
14
hz
5.01 x 10
14
hz
1.1 x 10
20
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?
1.34 x 10
-9
sec
1.85 x 10
-12
sec
1.55 x 10
-12
sec
1.2 x 10
-12
sec
8.67 x 10
-10
sec
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