Practice Problems
Thin Film Interference Glass Coating
Topics:
On this worksheet you will be investigating the basic properties of
thin film interference
revealed in different thicknesses of film on glass.
Page Directions
The numerical values in this worksheet are randomly generated allowing students the opportunity to conveniently practice, and drill, common situations.
Before beginning any given worksheet, please look over all of the questions and make sure that there are
no duplicate
answers shown for the same question. If duplicates are present simply refresh the page until every answer is unique.
In order to check an answer
(even when you are just starting the worksheet on Question 1)
it is necessary to
any questions that you have not answered. Once you start submitting answers, the page may be checked as many times as necesasary without changing the randomized answers. Relevant scoring will be provided at the top of the page only when you answer all of the questions on your original submission.
omit
Question 1
A thin film, n = 1.38, uniformly covers the top of a glass plate, n = 1.62. 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 both interfaces
at neither interface
air-film
film-glass
omit
Question 2
What is the wavelength of blue, 491-nm light as it travels through the film?
678 nm
303 nm
491 nm
356 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?
89 nm
178 nm
246 nm
123 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?
178 nm
89 nm
123 nm
246 nm
omit
Question 5
In general, when blue light is removed from white light, the film would appear to be which color?
magneta
grey
yellow
cyan
omit
Question 6
What is the frequency of the blue light as it travels through the film?
8.43 x 10
-4
hz
1.07 x 10
20
hz
6.11 x 10
14
hz
4.43 x 10
14
hz
omit
Question 7
If the glass plate is 28 centimeters thick, how many seconds would be required for the transmitted beam to travel through the glass?
1.85 x 10
-12
sec
1.51 x 10
-9
sec
1.49 x 10
-12
sec
9.33 x 10
-10
sec
1.9 x 10
-12
sec
PhysicsLAB
Copyright © 1997-2024
Catharine H. Colwell
All rights reserved.
Application Programmer
Mark Acton