When the adjustable mirror on the Michelson interferometer is ...

[mcmcdaniel]

When the adjustable mirror on the Michelson interferometer is moved 20 wavelengths, how many fringe pattern shifts would be counted?
 a. 5
  b. 10
  c. 20
  d. 40
  e. 80

Question 2

A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared ( = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
 a. 218
  b. 109
  c. 55
  d. 318
  e. 443

[kbennett34]

Answer to Question 1

e

Answer to Question 2

b

[mcmcdaniel]

Thanks for the timely response, appreciate it

[pangili4]

Gracias!