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 = 1.32, uniformly covers the top of a glass plate, n = 1.58. 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
at both interfaces
film-glass
omit
Question 2
What is the wavelength of red, 732-nm light as it travels through the film?
732 nm
555 nm
966 nm
463 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?
366 nm
183 nm
139 nm
277 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?
366 nm
277 nm
139 nm
183 nm
omit
Question 5
In general, when red light is removed from white light, the film would appear to be which color?
cyan
magneta
yellow
grey
omit
Question 6
What is the frequency of the red light as it travels through the film?
4.1 x 10
14
hz
3.1 x 10
14
hz
5.41 x 10
-4
hz
1.66 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?
1.37 x 10
-9
sec
1.86 x 10
-12
sec
8.67 x 10
-10
sec
1.59 x 10
-12
sec
1.18 x 10
-12
sec
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