A thin film of acetone (n =1.25) coats a thick glass plate (n = 1.50).White light is incident normal to the film. In the reflections, fully destructive interference occurs at 600 nm and fully constructive interference at 700 nm. Calculate the thickness of the acetone film.

A thin film of acetone (n =1.25) coats a thick glass plate (n = 1.50).White light is incident normal to the film. In the reflections, fully destructive interference occurs at 600 nm and fully constructive interference at 700 nm. Calculate the thickness of the acetone film.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter35: Diffraction And Interference

Section: Chapter Questions

Problem 45PQ

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Concept explainers

Diffraction of light

In physics, the term diffraction is defined as the bending of light around the corners of the obstacle. As a light ray passes by an aperture, it bends around the edges or through slits, it spreads out through a narrow opening. The diffracted light will produce fringes of bright and dark or colored bands which are labeled as a diffraction pattern.

Question

A thin film of acetone (n =1.25) coats a thick glass plate
(n = 1.50).White light is incident normal to the film. In the reflections,
fully destructive interference occurs at 600 nm and fully
constructive interference at 700 nm. Calculate the thickness of the
acetone film.

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