What is the minimum thickness of a glycerin film (n = 1.47)on which light of wavelength 688 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 thin film with one phase reversal, the minimum thickness for constructive interference is given by t = λ / (2n), where λ is the wavelength in the medium. Here, t = 688 nm / (2 * 1.47) = 234 nm / 2 = 117 nm.

What Is the Minimum Thickness of a Glycerin Film (N