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 = 1.31, uniformly covers the top of a glass plate, n = 1.63. 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?
at neither interface
film-glass
air-film
at both interfaces
omit
Question 2
What is the wavelength of red, 688-nm light as it travels through the film?
901 nm
422 nm
688 nm
525 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?
263 nm
131 nm
344 nm
172 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?
131 nm
172 nm
344 nm
263 nm
omit
Question 5
In general, when red light is removed from white light, the film would appear to be which color?
yellow
cyan
magneta
grey
omit
Question 6
What is the frequency of the red light as it travels through the film?
5.71 x 10
-4
hz
3.33 x 10
14
hz
4.36 x 10
14
hz
1.58 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?
1.66 x 10
-12
sec
1.26 x 10
-12
sec
1.86 x 10
-12
sec
8.67 x 10
-10
sec
1.41 x 10
-9
sec
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