Two thin layers of material with different indices of refraction ...

[lracut11]

Two thin layers of material with different indices of refraction are coated on a glass plate. The outer first material has n1 = 1.404, the inner second material has n2 = 1.176, and the glass has nglass = 1.62 . If light is incident from air on the first layer, what is the phase change relative to that of the first layer reflection for light that reflects from the glass?
 a. 180
  c. 360
  b. 540
  d. 0

Question 2

A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact.
 a. 3.6  10-4 m
  c. 1.8  10-5 m
  b. 1.8  10-4 m
  d. 3.6  10-5 m

[jjorrostieta]

Answer to Question 1

D

Answer to Question 2

C

[lracut11]

TYSM

[lcapri7]

Thanks for the timely response, appreciate it