What is the minimum thickness of a glycerin film (n = 1.47)on which light of wavelength 684 nm shines that results in constructive interference of the reflected light? Assume the film is surrounded front and back by air.

Question

Quizplus · Accepted Answer

Constructive interference occurs when the optical path difference is an integer multiple of the wavelength. For a film with air on both sides, the minimum thickness for constructive interference is given by t = (m + 0.5)λ / (2n), where m = 0 for the minimum thickness. Substituting the given values, t = (0 + 0.5) * 684 nm / (2 * 1.47) = 116 nm.

What Is the Minimum Thickness of a Glycerin Film (N