A thin film appears yellow when illuminated with white light. The color being cancelled by destructive interference is
A)red.
B)green.
C)white.
D)blue.
E)none of the above

Question

Quizplus · Accepted Answer

Since the thin film appears yellow, we know that it is causing constructive interference for the wavelengths of light that appear yellow to our eyes. To cancel this out with destructive interference, we need to consider the opposite color of yellow, which is blue. Therefore, the color that is being cancelled out by the thin film is blue.

A Thin Film Appears Yellow When Illuminated with White Light