When light reflects from a thin film, the distance between adjacent bright regions of the fringes depends on the film thickness being equal to the wavelength of the light times
A) 1/4.
B) 1/2.
C) 1.
D) 2.

Question

Quizplus · Accepted Answer

The distance between adjacent bright fringes in thin film interference depends on the condition that the path difference between the two waves (reflected and transmitted) is equal to half the wavelength of the light. This is because for constructive interference to occur, the waves must be in phase, which happens when the path difference is a multiple of half the wavelength.

When Light Reflects from a Thin Film, the Distance Between