When reflection fringes associated with a thin film are not uniformly spaced, the reason could be nonuniformities in
A) the film thickness.
B) the film index of refraction.
C) Both of the first two responses are valid.
D) Neither of the first two responses is valid.

Question

Quizplus · Accepted Answer

Nonuniformities in both the film thickness and the film index of refraction can cause reflection fringes associated with a thin film to be not uniformly spaced. Variations in thickness or index of refraction alter the path length and phase of reflected light, leading to irregular fringe patterns.

When Reflection Fringes Associated with a Thin Film Are Not