What is the minimum thickness of a nonreflecting film coating (n = 1.30) on a glass lens (n = 1.50) for wavelength 500 nm?
A)250 nm
B)192 nm
C)167 nm
D)96.2 nm
E)83.6 nm

Question

Quizplus · Accepted Answer

The minimum thickness of a nonreflecting film coating is given by:t = (λ/4n)where λ is the wavelength of light, n is the index of refraction of the film, and t is the thickness of the film.For a wavelength of 500 nm, a film with an index of refraction of 1.30, and a glass lens with an index of refraction of 1.50, the minimum thickness of the film is:t = (500 nm/4 * 1.30) = 96.2 nm

What Is the Minimum Thickness of a Nonreflecting Film Coating