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 = 1.34, 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
air-film
at both interfaces
at neither interface
omit
Question 2
What is the wavelength of blue, 466-nm light as it travels through the film?
282 nm
348 nm
624 nm
466 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?
87 nm
233 nm
174 nm
117 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?
233 nm
174 nm
87 nm
117 nm
omit
Question 5
In general, when blue light is removed from white light, the film would appear to be which color?
cyan
yellow
magneta
grey
omit
Question 6
What is the frequency of the blue light as it travels through the film?
1.04 x 10
20
hz
8.63 x 10
-4
hz
4.8 x 10
14
hz
6.44 x 10
14
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
1.93 x 10
-12
sec
1.37 x 10
-12
sec
1.72 x 10
-12
sec
9 x 10
-10
sec
PhysicsLAB
Copyright © 1997-2020
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton