Thin-Film Interference Is Observed When Polychromatic Light Is Incident on an Interface

Thin-film interference is observed when polychromatic light is incident on an interface formed by two semitransparent media.  Which of the following best explains why thin-film interference generates a multicolored array when two semitransparent fluids are used?

A) The density of the top fluid varies along the fluid interface.
B) The thickness of the top fluid varies along the fluid interface.
C) The osmolarity of the top fluid varies along the fluid interface.
D) The presence of two semitransparent fluids decreases the frequency of reflection.

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